class Fakultaet {
    public int fak(int number) {
        if (number < 0) {
            return 1;
        }
        int factorial = 1;
        int i = 1;
        while(i <= number){
            factorial = factorial * i;
            i = i + 1;
        }

        return factorial;
    }
    public static void main(String[] args) {
        Fakultaet f = new Fakultaet();
        int result = f.fak(5);
        print(result);
    }
}