В чем проблема?
package com.javarush.task.task05.task0532;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
public class Solution {
public static void main(String[] args) throws Exception {
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());
int e = Integer.parseInt(reader.readLine());
int t = Integer.parseInt(reader.readLine());
int maximum = max(a, b, c, d, e, t);
if (a > 0) {
System.out.println(maximum);
}
if (a <= 0)
return;
}
public static int max(int a, int b, int c, int d, int e, int t) {
if (a >= b && a >= c && a >= d && a >= e && a >= t)
return a;
else if (b >= a && b >= c && b >= d && b >= e && b >= t)
return b;
else if (c >= a && c >= b && c >= d && c >= e && c >= t)
return c;
else if (d >= a && d >= c && d >= b && d >= e && d >= t)
return d;
else if (e >= a && e >= b && e >= c && e >= d && e >= t)
return e;
else
return t;
}
}