import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.nextLine());
        int max =0;
        for (int i = 1; i <= N; i++) {
            int number = Integer.parseInt(sc.nextLine());
            if (number>max){
                max = number;
            }
        }
        System.out.println(max);
    }
}