class Fact {


    static int factorial(int i){
        if (i == 1) return 1;
        return i * factorial(i-1);
    }


    static int fa(int i){
        int sum = 1;
        for (int j = 1; j < i; j++) {
            sum *= j;
        }
        return sum;

    }


    public static void main(String[] args) {
        System.out.println(factorial(5));
    }

}