import java.util.Scanner;


public class Main {
	public static void main(String[] args){
		int max = Integer.MIN_VALUE;
		Scanner san = new Scanner(System.in);
		int listCount = san.nextInt();
		int[] list = new int[listCount];
		for(int i = 0; i < listCount; i++){
			list[i] = san.nextInt();
		}
		int min = list[0];
		for(int i = 1; i < listCount; i++){
			max = Math.max(max, list[i] - min);
			min = Math.min(min, list[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