import java.util.*;

class demo
{
    public static void main(String[] args) 
    {
        long i, n, f = 1;
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter an integer: ");
        n = sc.nextInt();
        for (i = 1; i <= n; i++) 
        {
            f = f * i;
        }
        System.out.print("Factotrial: " + f);
    }
}