import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long n = sc.nextLong();
        if (1000000 <= n) {
            System.out.println("000000000000");
        } else {
            long mod = 1000000000000L;
            long ans = 1;
            boolean flag = false;
            for (int i = 1; i <= n; i++) {
                ans *= i;
                if (ans >= mod) {
                    flag = true;
                }
                ans %= mod;
            }
            if (flag) {
                System.out.println(String.format("%012d", ans));
            } else {
                System.out.println(ans);
            }
        }
   }
}