UVA 623 - 500!

import java.math.BigInteger;

import java.util.Scanner;

 

class Main {

    public static void main(String args[]) {

        Scanner in = new Scanner(System.in);

        while(in.hasNext()) {

            int n = in.nextInt();

            BigInteger fact = BigInteger.ONE;

            for(int i = 1; i <= n; i++) {

                fact = fact.multiply(BigInteger.valueOf(i));

            }

            System.out.printf("%d!\n", n);

            System.out.println(fact.toString());

        }

    }

}