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)

using System;
using System.Linq;
using System.Collections.Generic;
using System.IO;
using System.Diagnostics;
using System.Text;

public class Program{
    public static void Main(){
        var watch =  new Stopwatch();
        watch.Start();
        bool istest = false;
        var stream = new StreamWriter(Console.OpenStandardOutput()){AutoFlush = false};
        Console.SetOut(stream);
        TextReader reader;
        string filename="";
        if(filename.Length!=0){
            reader = new StreamReader(filename);
        }else{
            reader = Console.In;
        }

        var n = int.Parse(reader.ReadLine());
        var yo = (long)Math.Pow(10, 9)+7;
        //制限がゆるいのでなんとなくでいいや
        //var yoyo = Enumerable.Range(1, n).Aggregate(((double sum, double nex)=>( (sum%yo)*(nex%yo) % yo)));
        long yoyo = 1;
        foreach (var k in Enumerable.Range(1, n))
        {
            yoyo = (yoyo*k)%yo;
        }
        Console.WriteLine(yoyo);
        watch.Stop();
        if(istest){
            Console.WriteLine($"実行時間{watch.ElapsedMilliseconds}ミリ秒");
        }
        Console.Out.Flush();
    }
}