here's my code : I tried both of code in comments and after comment. public class Solution { public static void main(String[] args) throws Exception { //write your code here BufferedReader reader = new BufferedReader(new InputStreamReader(; String aa = reader.readLine(); String bb = reader.readLine(); String cc = reader.readLine(); String dd = reader.readLine(); int a = Integer.parseInt(aa); int b = Integer.parseInt(bb); int c = Integer.parseInt(cc); int d = Integer.parseInt(dd); System.out.println(max(a,b,c,d)); } //if (((a>b)&&(a>c))&&(a>d)){ //System.out.println(a); //} //else if (((c>b)&&(c>a))&&(c>d)){ //System.out.println(c); //} //else if (((b>a)&&(b>c))&&(b>d)){ //System.out.println(b); //} //else if (((d>b)&&(d>c))&&(d>a)){ //System.out.println(d); //} public static int max(int a, int b){ return a>b ? a : b; } public static int max(int a, int b, int c, int d){ int p = max(a>d); int q = max(c>d); return p>q ? p : q; } }