import java.util.Scanner;

public class No500 {
    public static void main(String[] args){
        long N=0;
        Scanner sc = new Scanner(System.in);
        N = sc.nextLong();
        
        culc(N);
    }
    static void culc(long N){
        long mod = (long) Math.pow(10, 12); //1,000,000,000,000
        boolean moreThan12Digits = false;
        long ans=1;
        
        for(int i=2; i<=N; i++){    
            ans *= i;
            if(moreThan12Digits && ans == 0)break;  //下12桁が全て0になったら終了
            if(ans >= mod){
                ans %= mod;
                moreThan12Digits = true;
            }
        }
        if(moreThan12Digits){
            System.out.printf("%012d\n", ans);
        }else{
            System.out.println(ans);
        }
    }
}