import java.util.Scanner;
public class Factorial{
    public static void main(String[] args){
        Scanner num = new Scanner(System.in);
        long n = num.nextInt();
        long result = 1;

        for (int i=1 ; i <= n; i++){
            result *= i;
        }
        System.out.println(n + "! = " + result);
    }
}