package Ex08Factoriel;
import java.util.Scanner;
public class Try01 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num =Integer.parseInt(scanner.nextLine());
        int factorial =1;
        for (int i = 1; i <=num; i++) {
            factorial = factorial*i;


        }
        System.out.println(factorial);
    }
}
// 1*2*3...*n