import java.util.Scanner;

public class Demo {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine());
        int maximumNumber = Integer.MIN_VALUE;

        for(int i=1; i<=n; i++){
            int currentNumber = Integer.parseInt(scanner.nextLine());

            if (currentNumber > maximumNumber){
                maximumNumber = currentNumber;
            }
        }
        System.out.println(maximumNumber);
    }
}