import java.util.*;

public class main{
    public static void main(String arg[]){
        Scanner s = new Scanner(System.in);
        int in = s.nextInt();
        if(in>=1 && s.HasNextInt()){
            int arr[] = new int[in];
            int larg = 0;
            for(int i =0 ; i<in;i++){
                arr[i] = s.nextInt();
            }
            for(int i =0 ; i<in;i++){
                if(arr[i]>larg){
                    larg = arr[i];
                }
            }
            System.out.print(larg);
        }
        else{
            System.out.print("Invalid input");
        }
    }
}