Кирилл Деменев

package com.company;

import java.util.Scanner;

public class Main {

    static int factorial(int a, int b){
        for(int i=1; i<=a;i++){
            b=i*b;
        }
        return b;
    }

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);

        int a =in.nextInt();
        int b=1;
        System.out.println(factorial(a,b));
    }
}