Что не так?
package com.javarush.task.task05.task0532;
import java.io.*;
/*
Задача по алгоритмам
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int maximum = 0, n = 0, a = 0;
n = Integer.parseInt(reader.readLine());
for (int i = 1; i <= n; i++)
{
a = Integer.parseInt(reader.readLine());
if (a > maximum)
maximum = a;
}
System.out.println(maximum);
}
}