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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 = Integer.MIN_VALUE;
        int N = Integer.parseInt(reader.readLine());
        if (N > 0) {
            for (int i = 1; i <= N; i++) {
                int num = Integer.parseInt(reader.readLine());
            }
            if (num > maximum)
                maximum = num;
        }

        System.out.println(maximum);
    }
}