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 n = Integer.parseInt(reader.readLine());
        int maximum = Integer.parseInt(reader.readLine());
        int k = 1;
        while(true){
            k++;
            int numb = Integer.parseInt(reader.readLine());
            if (numb >= maximum)
                maximum = numb;
            if (k == n)
                break;
        }
        System.out.println(maximum);
    }
}