import java.util.*;

public class Main {
    static int findMax(int[] arr, int n) {
        
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        if (!sc.hasNextInt()) {
            System.out.println("Invalid input");
            return;
        }
        int n = sc.nextInt();
        if (n <= 0) {
            System.out.println("Invalid input");
            return;
        }
        int[] arr = new int[n];
        for (int i = 0; i < n; i++) {
            if (!sc.hasNextInt()) {   // check if input is numeric
                System.out.println("Invalid input");
                return;
            }
            arr[i] = sc.nextInt();
        }

        int result = findMax(arr, n);
        System.out.println(result);
    }
}