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 4.6.2.0) (judge verdict: Accepted)

class Program
{
    static void Main(string[] args)
    {
        var line = System.Console.ReadLine().Trim();
        int N = int.Parse(line);

        ulong totalpower = 1L;

        for (int i = 0; i < N; i++)
        {
            totalpower = totalpower * (ulong)(i + 1);


            ulong a = totalpower % 107;


            if (totalpower >= System.Math.Pow(10, 9))
            {
                totalpower = totalpower % 1000000007;
            }

        }
        System.Console.WriteLine(totalpower);
    }
}