Problem:
Factorial

Write a program which reads an integer n and prints the factorial of n. You can assume that n ≤ 20.

Input

An integer n (1 ≤ n ≤ 20) in a line.

Output

Print the factorial of n in a line.

Sample Input

5

Output for the Sample Input

120

Solution in JAVA (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main{
	public Main(){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int t = 1;
		
		while(n > 1){
			t *= n--;
		}
		
		System.out.println(t);
	}

	public static void main(String[] args){
		Main test = new Main();
	}
}