import java.util.Scanner;
public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main (String[] args) {
		int n = sc.nextInt();	
		int A [] = new int [n+1];
		for (int i=1; i<=n; i++){
			A[i]=sc.nextInt();
		}
		int min = Integer.MAX_VALUE;
		int diff= Integer.MIN_VALUE;
		for (int j=1; j<n; j++){
			min = Math.min(min, A[j]);
			diff = Math.max(diff, A[j+1]-min);
		}
		System.out.println(diff);
	}
}
/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