import java.io.*;
import java.util.*;


public class Main_yukicoder500 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		long n = sc.nextLong();

		if (n > 100) {
			pr.println("000000000000");
		} else {
			long ret = 1;
			boolean flag = false;
			for (int i = 2; i <= n; i++) {
				ret *= i;
				if (ret >= 1_000_000_000_000L) {
					ret %= 1_000_000_000_000L;
					flag = true;
				}
			}

			if (flag) {
				pr.printf("%012d\n", ret);
			} else {
				pr.println(ret);
			}
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}