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 static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int fact = factorial(sc.nextInt());
		System.out.println(fact);

	}

	public static int factorial(int fact){
		if(fact != 0){
			for(int i = fact-1;i >= 1;i--){
				fact *= i;
			}
		}
		return fact;
	}
}