ProgBasicsJavaBook7.1ComplexLoop08factorial

import java.util.Scanner;

public class E08factorial {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());
        int fact = 1;

        do {
            fact = fact * n;
            n--;
        } while (n > 1);
        System.out.println(fact);

    }
}