import java.util.*;

public class Main{
    public static void main(String args[]){
        Scanner sc =new Scanner(System.in);
        int n= sc.nextInt();
        if(n<1 || n>1000){
            System.out.println("Invalid input");
            return;
        }
        int temp=MIN_INTEGER;
        int[] arr= new int[n];
        for(int i=0;i<n;i++){
            arr[i]=sc.nextInt();
            if(arr[i]>temp){
                temp=arr[i];
            }
        }
        System.out.print(temp);
    }
}