import java.util.*;

public class Main{
    public static void main(String args[]){
        Scanner cin = new Scanner(System.in);
        long target = cin.nextLong();
        long tmp =(long) (func(target)%Math.pow(10,13));
        System.out.println(tmp);  
    }
static long func(long x){
    if (x==0){
        return 1;
    } else {
        return x*func(x-1);
    }
}
}