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;

        //напишите тут ваш код
        int count = -1;
        while(count < 0){
            System.out.print("Insert count: ");
            count = Integer.parseInt(reader.readLine());
        }
        int a;

        for (int i = 0; i < count; i++) {
            a = Integer.parseInt(reader.readLine());
            if (a < 0) {
                System.out.println("Insert number > 0!");
                i--;
            }
            else if (a > maximum) {
                maximum = a;
            }
        }

        System.out.println(maximum);
    }
}