public class AckermannFunction {
    public static int ackermann(int m, int n) {
        if (m == 0) {
            return n + 1;
        }
        if (n == 0) {
            return ackermann(m - 1, 1);
        }
        return ackermann(m - 1, ackermann(m, n - 1));
    }

    public static int main() {
        System.out.println(ackermann(0, 0));
        System.out.println(ackermann(0, 5));
        System.out.println(ackermann(1, 0));
        System.out.println(ackermann(1, 5));
        System.out.println(ackermann(2, 0));
        System.out.println(ackermann(2, 5));
        System.out.println(ackermann(3, 0));
        return 0;
    }
}