// editor1
import java.util.*;
public class main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int x;
        int arr[] = new int[n];
        if(n<0||!sc.hasnextInt()){
            System.out.print("Invalid input");
        }
        for(int i=0; i<n; i++) {
            x = sc.nextInt();
            arr[i]= x;
        }
        Arrays.sort(arr);
        System.out.print(arr[n-1]);
    }
}