母牛的故事 （Java代码）

import java.util.*;

public class Main{

public static int m(int n) {

if (n > 0 && n <= 4) {

return n;

} else {

return m(n - 1) + m(n - 3);

}

}

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int[] n = new int[4];

for (int i = 0; i < 4; i++) {

n[i] = sc.nextInt();

}

for (int i = 0; i < 4; i++) {

if (n[i] > 0)

System.out.println(m(n[i]));

}

}

}