что не так

package com.javarush.task.task02.task0217; /* Минимум четырех чисел */ public class Solution { public static int min(int a, int b, int c, int d){ int a = -20; int b = -40; int c = -40; int d = -40; int minab; int mincd; int minabcd; minab = min(a,b); mincd = min(c,d); minabcd = min(minab,mincd); return minabcd; int m2; if ( a < b) m2 = a ; else m2 = b; int m4; if ( c < d) m4 = c; else m4 = d; int m5; if (m2 < m4) m5 = m2; else m5 = m4; return m5; } public static int min(int a, int b) { //напишите тут ваш код int m3; if ( a < b) m3 = a; else m3 = b; return m3; } public static void main(String[] args) throws Exception { System.out.println(min(-20, -10)); System.out.println(min(-40, -10, -30, 40)); System.out.println(min(-20, -40, -30, 40)); System.out.println(min(-20, -10, -40, 40)); System.out.println(min(-20, -10, -30, -40)); } }