import java.util.*;

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int[] num_list = new int[n];
    for (int i = 0; i < n; i++){
      num_list[i] = sc.nextInt();
    }
    max_value(num_list, n);
  }

  public static void max_value(int[] lst, int n){
    int maxval = -2000000000;
    int minval = lst[0];
    for (int i = 0; i < n - 1; i++){
      maxval = Math.max(maxval, lst[i + 1] - minval);
      minval = Math.min(minval, lst[i + 1]);
    }
    System.out.println(maxval);
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz