import java.util.*;

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

    int max = -2000000000;
    int min = r[0];
    for(int i = 1; i < n; i++){
      max = Math.max(max,r[i]-min);
      min = Math.min(min,r[i]);
    }
    System.out.println(max);
  }
}


/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