import java.util.*;
import static java.lang.System.*;
import java.math.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		long n = sc.nextLong();
		if (n >= 50) {out.println("000000000000");}
		else {
			BigInteger bi = new BigInteger("1");
			for (int i=1; i<=n; i++) {
				BigInteger temp = new BigInteger(String.valueOf(i));
				bi = bi.multiply(temp);
			}
			StringBuilder ans = new StringBuilder(bi.toString());
			if (ans.length() > 12) {
				ans.delete(0,ans.length()-12);
			}
			out.println(ans);
		}
	}
}