import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int max=0;
        int ht[] = new int[n];
        for(int i=0; i < n;i++){
            ht[i] = in.nextInt();
        }
         max=ht[0];
        
         for(int i=0;i<n;i++)
             {
            
             if (max<=ht[i+1])
                 max=ht[i+1];
         }
        System.out.println(max);
        
        
        
    }
}