package com.javarush.task.task05.task0532;

import java.io.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.Reader;

public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int N;
        String n = reader.readLine();
        N = Integer.parseInt(n);
        int maximum = Integer.MIN_VALUE;
        if ( N > 0) {

        for (int i = 1; i <= N; i++) {
            String InCount = reader.readLine();
            int count = Integer.parseInt(InCount);

            if (count > maximum)
            {
                maximum = count;
            }
        }
         if (maximum > 0)  System.out.println(maximum);
        }

    }

}