delivered the opinion of the Court.
Defendant Cecil Bernhard appeals from a judgment entered on a jury verdict in the district court, Lincoln County, convicting him of operating a motor vehicle wrecking facility without a license, a misdemeanor.
*466On November 6, 1975, a complaint charging defendant with operating a motor vehicle wrecking facility without a license, in violation of section 69-6802, R.C.M.1947, was filed in Lincoln County justice court. On November 26, 1975, following a jury trial in which defendant was found guilty of the charge, he was fined $300 and sentenced to 30 days in the county jail. Defendant appealed to the district court and on March 1, 1976, was again found guilty by a six person jury. The district court imposed a fine of $250 and a jail sentence of 30 days, both of which were to be suspended provided defendant procured a license to operate a motor vehicle wrecking facility within 30 days of the judgment date. Defendant appeals from this judgment.
At all stages of the proceedings herein defendant appeared and at his request, acted as his own counsel.
Defendant owns a parcel of land located approximately one-half mile from Eureka. This land is abutted by two county roads. On a portion of this land defendant kept between 60 and 100 unlicensed, discarded motor vehicles.
Effective May 1, 1974, Lincoln County began administering a “junk vehicle” program pursuant to Ch. 68, Title 69, Revised Codes of Montana, 1947. This act and the regulation promulgated thereunder provide for the licensing and regulation of motor vehicle wrecking facilities, the control of junk vehicles in nonwrecking yard locations, and the establishment of motor vehicle graveyard facilities.
Terrence Schultz, Lincoln County sanitarian, was given authority to administer the program by the Lincoln County commissioners. Schultz first met with defendant on May 16, 1974, and explained to him that the discarded vehicles on his property did not comply with the law. A letter dated June 3, 1974, from the sanitarian to defendant further explained the new law and the consequences of noncompliance. Defendant responded with a letter to the sanitarian in which he expressed a desire to “work something out” with respect to his use of the property involved. *467On July 2, 1974, defendant and Schultz met again and discussed alternative means of conforming defendant’s property to the statutory requirements. Defendant’s failure to comply with those requirements resulted in a charge of operating a motor vehicle wrecking facility without a license being filed against him in Lincoln County justice court. Defendant was convicted following a jury trial on December 17, 1974.
Defendant’s continued refusal to procure a- license after his first conviction triggered a second prosecution for violating the act, initiated on November 6, 1975. The present appeal is taken from the district court judgment following conviction on the second charge of operating a motor vehicle wrecking facility without a license.
Defendant challenges the constitutionality of section 69-6802 in this appeal. Specifically, he contends that this statute unconstitutionally allows a taking of property without due process and that the statute under which he was convicted is an ex post facto law. Defendant also contends that the first conviction for violating the statute was a bar to a second prosecution under the same statute and he was therefore subjected to double jeopardy.
Defendant contends that due process requires just compensation to be given to a landowner whose use of his property is restricted by the statute. The state argues the statute is a valid exercise of its police power and that as such no compensation need be given. Clearly, when the police power has been properly invoked, compensation is not required. Atlantic Coast Line R.R. Co. v. City of Goldsboro, 232 U.S. 548, 34 S.Ct. 364, 58 L.Ed. 721.
The license required when a person has four or more junk vehicles at a single location constituting a motor vehicle wrecking facility is not granted unless the vehicles are shielded from public view, pursuant to M.A.C. 16-2.14(2)-S 14261.
Defendant’s argument seems to be that the shielding requirement is without foundation and therefore cannot support the state’s exercise of its police power.
*468On the other hand, the state contends its police power is broad enough to include aesthetic considerations which underlie the shielding requirement, and therefore the statute is a valid exercise of the state’s police power.
Aesthetic considerations have supported an exercise of the police power to force removal of roadside advertising without compensation. Markham Advertising Company v. State, 73 Wash.2d 405, 439 P.2d 248, appeal dismissed 393 U.S. 316, 89 S.Ct. 553, 21 L.Ed.2d 512, reh. den. 393 U.S. 1112, 89 S.Ct. 854, 21 L.Ed.2d 813.
Other jurisdictions have taken the view that aesthetic considerations alone may warrant the exercise of police power with respect to motor vehicle junkyard requirements. Oregon City v. Hartke, 240 Or. 35, 400 P.2d 255; Rotenberg v. Fort Pierce (Fla.App. 1967), 202 So.2d 782; Racine County v. Plourde, 38 Wis.2d 403, 157 N.W.2d 591.
Article II, Section 3, 1972 Montana Constitution declares that the right to a “clean and healthful environment” is an inalienable right of a citizen of this state. Consistent with this statement and the cases cited, we hold that a legislative purpose to preserve or enhance aesthetic values is a sufficient basis for the state’s exercise of its police power in section 69-6802 and M.A.C. 16-2.14(2)-S 14261.
Defendant alleges also that section 69-6802 is an ex post facto law. However, he was charged with maintaining four or more junked vehicles on his property after the statute was in effect; he was not subjected to a penalty for having the vehicles prior to that time. His contention therefore, that this is an ex post facto application of the statute is groundless. In Samuels v. McCurdy, 267 U.S. 188, 45 S.Ct. 264, 69 L.Ed. 568, 570, the United States Supreme Court rejected defendant’s argument that his conviction under a law prohibiting possession of liquor was invalid since his possession of the liquor predated the effective date of the prohibition act. There the court stated:
“This law is not an ex post facto law. It does not provide a *469punishment for a past offense. It does not fix a penalty for the owner for having become possessed of the liquor. The penalty it imposes is for continuing to possess the liquor after the enactment of the law. * * *” 267 U.S. 193, 45 S.Ct. 265, 69 L.Ed. 570.
Applying this test to defendant’s maintenance of his vehicles, it is clear that there was no ex post facto application of section 69-6802.
Neither is there merit in defendant’s contention that his conviction on the second charge of failure to license his junk vehicle accumulation was constitutionally barred by the earlier conviction for violating the same statute.
Defendant argues that his refusal to procure a license or shield his property is a single, ongoing act for which Be prosecuted only once. In State v. Boe, 143 Mont. 141, 146, 388 P.2d 372, this Court stated with respect to the constitutional protection against double jeopardy:
“The controlling word is offenses, it does not refer to acts.”
One test used by this Court to measure the necessary identity of offenses was enunciated in State v. Parmenter, 112 Mont. 312, 316, 116 P.2d 879. There the test was whether:
“* * * ajj (.jjg evidence relied upon to support the conviction under the second information would have been admissible and would have sustained a conviction under the first information.”
In the present case, the two separate complaints charged distinct offenses. The second charge was based on defendant’s failure to have a license for a motor vehicle wrecking facility on November 6, 1975. The first complaint alleged that he did not have the necessary license on August 28, 1974. The prosecution could not have known of the second offense at the time of charging defendant for the first offense. As the United States Supreme Court stated in United States v. Ewell, 383 U.S. 116, 86 S.Ct. 773, 15 L.Ed.2d 627, 633, Fifth Amendment protection against being twice put in jeopardy:
*470“* * * js no(- properly invoked to bar a second prosecution unless the ‘same offense’ is involved in both the first and the second trials.
“ * * * If the two offenses are not, however, the same, then the Double Jeopardy Clause by its own terms does not prevent the current prosecution * *
Another question raised by defendant as a part of his attack on the constitutionality of the statute under which he was charged properly concerns the construction of the statute as it applies to defendant’s use of his property.
Defendant was charged with violating section 69-6802, R.C.M. 1947, which provides in part:
“A person may not conduct, maintain, or operate a motor vehicle wrecking facility without a license issued by the department.”
Section 69-6801(1), R.C.M.1947, defines a motor vehicle wrecking facility:
“(1) ‘Motor vehicle wrecking facility’ means a facility buying, selling, or dealing in four (4) or more vehicles per year of a type required to be licensed, for the purpose of wrecking, dismantling, disassembling, or substantially changing the form of the motor vehicle, or which buys or sells integral secondhand parts or component material thereof, in whole or in part, and deals in secondhand motor vehicle parts. The term does not include a garage where wrecked or disabled motor vehicles are temporarily stored for a reasonable period of time for inspection, repairs, or subsequent removal to a junkyard.”
Defendant concedes in this appeal, as he conceded at the district court trial, that he possesses four or more junk vehicles on his property. He testified that he has neither done business at the site nor added or removed any vehicles since the statute went into effect. Defendant argues that he was not operating a motor vehicle wrecking facility.
*471In Cosgrove v. Industrial Indemnity Company, 170 Mont. 249, 552 P.2d 622, 624, this Court stated:
“In construing a statute, the Court must determine the plain meaning of the words used. The language is to be interpreted in accordance with its usual, ordinary, and accepted meaning, and the intention of the legislature in enacting it must be gathered from the language employed therein. Section 93-401-15, R.C.M. 1947; County of Hill v. County of Liberty, 62 Mont. 15, 203 P. 500; * * * State v. Midland Nat’l Bank, 132 Mont. 339, 317 P.2d 880.”
Section 69-6801(1) states that a facility must “buy, sell, or deal” in motor vehicles or parts or materials thereof to constitute a “motor vehicle wrecking facility.” This language is not ambiguous. The legislature clearly intended to require licensing of facilities at which business activity related to junk vehicles is being carried on. The definition of “motor vehicle wrecking facility” by its own terms does not include mere accumulations of junk vehicles.
In analyzing the proof at the trial, we note:
“Possession at a single location, of four (4) or more junk vehicles of a type required to be licensed, is prima facie evidence that the possessor is operating a motor vehicle wrecking facility.” Section 69-6803(1), R.C.M.1947.
Additionally, the presence of between 60 and 100 junk vehicles on defendant’s property, unexplained, is some evidence of “dealing” in junk motor vehicles within the meaning of section 69-6801(1), R.C.M. 1947.
The opposing evidence consists solely of defendant’s testimony. In substance, defendant denied that he was “operating a wrecking yard”; stated that he had not “sold enough parts in the last year to pay for a license”; and testified:
“Over the years I have sold a few parts now and then when someone would contact me and come to me. I have given some away and I have sold some for a few dollars but not since this law has gone into effect.”
*472Two different juries weighed this opposing evidence and convicted the defendant of operating a motor vehicle wrecking facility without a license. It is axiomatic that the function of the jury is to determine the credibility of the witnesses and the weight to be given their testimony and so resolve the ultimate question of fact in this case, viz. did defendant operate a motor vehicle wrecking facility? The jury resolved this factual dispute by their verdict and we, as the appellate court, will not interfere where as here, there is substantial evidence to support the verdict.
Judgment affirmed.'
MR. CHIEF JUSTICE HATFIELD and JUSTICES DALY and HARRISON concur.