程序代码：

public static Integer compute(Integer n, Integer m) {
        if (m == 0) {
            return n;
        }
        return (n - (m - 1)) * compute(n,m-1);
    }

    public static void main(String[] args) {
        int n = 1;
        int m = 1;
        Integer number =  compute(n, m);
        System.out.println(number);
    }