What does this want to happen for negative numbers?

package com.codegym.task.task05.task0532; import java.io.*; /* Task about algorithms */ public class Solution { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); int maximum=0; int count; boolean first = true; int n = Integer.parseInt(reader.readLine()); if (n > 0) { for (count = 0; count < n; count++) { int a = Integer.parseInt(reader.readLine()); if (first) { maximum = a; first = false; } maximum = (a > maximum ? a : maximum); } }else; if (maximum <= 0) ; else System.out.println(maximum); } }