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

public class Main {
    static final long MOD = 1000000000000L;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        long n = sc.nextLong();
        if (n / 5 >= 12) {
            System.out.println("000000000000");
        } else {
            long ans = 1;
            boolean over = false;
            for (int i = 1; i <= n; i++) {
                ans *= i;
                over |= (ans >= MOD);
                ans %= MOD;
            }
            if (over) {
                System.out.printf("%012d\n", ans);
            } else {
                System.out.println(ans);
            }
        }
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}