I don`t understand where is the problem. Please help!
package com.codegym.task.task04.task0419;
/*
Maximum of four numbers
*/
import java.util.Scanner;
public class Solution {
public static void main(String[] args) throws Exception {
Scanner in = new Scanner(System.in);
int a = in.nextInt();
int b = in.nextInt();
int c = in.nextInt();
int d = in.nextInt();
if(a > b && a > c && a > d){
System.out.println(a);
}
else if(b > a && b > c && b > d){
System.out.println(b);
}
else if(c > a && c > a && c > d){
System.out.println(c);
}
else if(d > a && d > b && d > c){
System.out.println(d);
}
else if(a == b && b == c && c == d){
System.out.println(a);
}
}
}