package com.codegym.task.task05.task0532;
import java.io.*;
/*
Task about algorithms
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int maximum = 0;
int N = Integer.parseInt(reader.readLine());
int[] num = new int[N];
for (int i = 0; i < N; i++) {
num[i] = Integer.parseInt(reader.readLine());
if (num[i] >= maximum) maximum = num[i];
}
//write your code here
System.out.println(maximum);
}
}