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 C# (Mono-mcs 6.8.0.105) (judge verdict: Accepted)

using System;

class Program
{
	static void Main()
	{
		var n = int.Parse(Console.ReadLine());
		if (n > 1) {
			var power = 1L;
			var max = (long)Math.Pow(10, 9) + 7L;
			for (var i = 2; i <= n; ++i) {
				power = power * i % max;
			}

			Console.WriteLine(power);
		} else {
			Console.WriteLine(1);
		}

		//デバッグ実行での確認用。そのまま提出しても問題なし
		Console.ReadKey();
	}
}