I don't see mistake.. help me
package pl.codegym.task.task04.task0419;
/*
Największa z czterech liczb
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
//tutaj wpisz swój kod
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int a = Integer.parseInt(reader.readLine());
int b = Integer.parseInt(reader.readLine());
int c = Integer.parseInt(reader.readLine());
int d = Integer.parseInt(reader.readLine());
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 > b && c > d)
System.out.println(c);
else if (d > a && d > c && d > b)
System.out.println(d);
else if ((a >= b ) && (a == c || a == d)){
System.out.println(a);
}
else if ((a >= c ) && (a == b || a == d)){
System.out.println(a);
}
else if (( a >= d) && (a == c || a == b)){
System.out.println(a);
}
else if ((b >= a ) && (b == c || b == d)){
System.out.println(b);
}
else if ((b >= c ) && (b == b || b == d)){
System.out.println(b);
}
else if ((b >= d) && (b == c || b == b)){
System.out.println(b);
}
}
}