Problem:
Score : 200 points

Problem Statement

Snuke loves working out. He is now exercising N times.

Before he starts exercising, his power is 1. After he exercises for the i-th time, his power gets multiplied by i.

Find Snuke's power after he exercises N times. Since the answer can be extremely large, print the answer modulo 10^{9}+7.

Constraints

1 ≤ N ≤ 10^{5}

Input

The input is given from Standard Input in the following format:

N

Output

Print the answer modulo 10^{9}+7.

Sample Input 1

3

Sample Output 1

6

After Snuke exercises for the first time, his power gets multiplied by 1 and becomes 1.

After Snuke exercises for the second time, his power gets multiplied by 2 and becomes 2.

After Snuke exercises for the third time, his power gets multiplied by 3 and becomes 6.

Sample Input 2

10

Sample Output 2

3628800

Sample Input 3

100000

Sample Output 3

457992974

Print the answer modulo 10^{9}+7.

Solution in Java7 (OpenJDK 1.7.0) (judge verdict: Time Limit Exceeded)

import java.io.InputStreamReader;
import java.util.Scanner;
import java.math.BigInteger;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner scan = new Scanner(System.in); 
        String n = scan.next();
        BigInteger N = new BigInteger(n);
        long c = Long.parseLong(n);
        BigInteger one = new BigInteger("1");
        BigInteger x = new BigInteger("1");
        while(c > 0){
            x = x.multiply(N);
            N = N.subtract(one);
            c = c - 1;
        }
        BigInteger num = new BigInteger("1000000007");
        BigInteger y = x.remainder(num);
        System.out.println(y);
    }
}