package SoftUni_Java_Fundamentals;

import java.util.Scanner;

public class FactorialDivision {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = Integer.parseInt(scanner.nextLine());
        int b = Integer.parseInt(scanner.nextLine());
        DivideFactorials(a,b);
    }

    private static void DivideFactorials(int a, int b) {
        int factoriel1 = 1;
        int factoriel2 = 1;
        for (int i = 1; i <= a; i++) {
            factoriel1*=i;
        }
        for (int i = 1; i <= b; i++) {
            factoriel2*=i;
        }
       double division = factoriel1/factoriel2;
        System.out.printf("%.2f",division);
    }
}