what is wrong with my code
package com.codegym.task.task04.task0419;
/*
Maximum of four numbers
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String a=br.readLine();
String b=br.readLine();
String c=br.readLine();
String d=br.readLine();
int x=Integer.parseInt(a);
int y=Integer.parseInt(b);
int z=Integer.parseInt(c);
int v=Integer.parseInt(d);
if(x>=y&&z>=v){
if(x>z){
System.out.println(x);}
else{
System.out.println(z);}}
else if(y>=x&&v>=z){
if(y>v){
System.out.println(y);
}else{
System.out.println(v);}}
}
}