package com.telerikacademy;

import java.util.Scanner;

public class MaxNum {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int numbers = Integer.parseInt(scanner.nextLine());
        int max = 0;

        for (int i = 1; i <= numbers; i++) {
            int nextNumber = Integer.parseInt(scanner.nextLine());
            for (int j = nextNumber; j <= nextNumber; j++) {
                if (nextNumber >= max) {
                    max = nextNumber;
                }
            }
        }
        System.out.println(max);
    }
}