ЧЕГО?
package com.javarush.task.task05.task0532;
import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/*
Задача по алгоритмам Ӏ Java Syntax: 5 уровень, 12 лекция
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int count = Integer.parseInt(reader.readLine());
int[] quantity = new int[count];
for (int i = 0; i <count ; i++) {
quantity[i] = Integer.parseInt(reader.readLine());
}
Arrays.sort(quantity);
int maximum = quantity[quantity.length-1] ;
if(maximum >= 0)
System.out.println(maximum);
}
}