what is the problem in this solution?? Can any one explain

Question about the task

Archived

public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int maximum = 0;
        int N = Integer.parseInt(reader.readLine());
        int c =0,a =0;
        while(N>0 &&c != N){
            a = Integer.parseInt(reader.readLine());
            c++;
            if(a>=maximum)
            maximum = a;
        }

        System.out.println(maximum);
    }
}

Write a program that:
1. reads a number N (must be greater than 0) from the console
2. reads N numbers from the console
3. Displays the maximum of the N entered numbers.

Requirements:

The program should read the numbers from the keyboard.
The program must display a number on the screen.
The class must have a public static void main method.
Don't add new methods to the Solution class.
The program should display the maximum of the N entered numbers.
The program should not display anything if N is less than or equal to 0.

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 N = Integer.parseInt(reader.readLine()); int c =0,a =0; while(N>0 &&c != N){ a = Integer.parseInt(reader.readLine()); c++; if(a>=maximum) maximum = a; } System.out.println(maximum); } }