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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.*;
import java.util.*;

public class Main{

	static class FastReader{
		BufferedReader br;
		StringTokenizer st;
		public FastReader(){
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		public String next(){
			try{
				while(st==null||!st.hasMoreElements()){
					st = new StringTokenizer(br.readLine());
				}
			}catch(Exception e){
				e.printStackTrace();
			}
			return st.nextToken();
	
		}
		public int nextInt(){
			return Integer.parseInt(next());
		}
		public long nextLong(){
			return Long.parseLong(next());
		}
		public double nextDouble(){
			return Double.parseDouble(next());
		}
		public String nextLine(){
			String s = "";
			try{
				s = br.readLine();
			}catch(Exception e){
				e.printStackTrace();
			}	
			return s;		
		}
	} 
	static long mod = (int)1e9+7;
	public static long fact(int n){
		long pr =1;
		for(int i = 1; i <= n; i++){
			pr=(pr*i)%mod;
		}
		return pr;
	}
	public static void main(String[] args){
		FastReader in = new FastReader();
		PrintWriter out = new PrintWriter(System.out);
		int n = in.nextInt();
		out.println(fact(n));	
		out.flush();
		out.close();  
	}

}