// editor2
import java.util.*;
public class tracking{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n =sc.nextInt();
        int[] num=new int[n];
        if(n <= 0  ){
            System.out.println("Invalid input");
            return;
        }
        if(!hasNextint()){
            System.out.println("Invalid input");
            return;
        }
        
        int largest = Integer.MIN_VALUE;
        for(int i =0;i<n;i++){
            num[i] = sc.nextInt();
            if(num[i] > largest){
                largest = num[i];
                
            }
            
            
        }
        System.out.println(largest);
    }
}