import java.util.Scanner;

public class Main{
	
	static final Scanner s=new Scanner(System.in);
	
	public static void main(String[] __){
		long res=1,n=s.nextLong();
		
		boolean f=false;
		for(int i=2;i<=n&&res!=0;i++) {
			res*=i;
			
			f|=res>1000000000000L;
			res%=1000000000000L;
		}
		System.out.printf(f?"%012d\n":"%d\n",res);
	}
}