import java.util.*;

public class Main{
        public static void main(String[] args){
                try(Scanner sc = new Scanner(System.in)){
                        long N = sc.nextLong();
                        long ans = 1;
                        boolean f = false;
                        for(long i = 1; i <= N; i++){
                                ans *= i;
                                if(f && ans == 0){
                                        break;
                                }
                                if(ans >= 1000000000000L){
                                        f = true;
                                        ans %= 1000000000000L;
                                }
                        }
                        if(f){
                                System.out.printf("%012d\n", ans);
                        } else {
                                System.out.println(ans);
                        }
                }
        }
}