

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = null;
		try {
			sc = new Scanner(System.in);
			//?????°???????????????
			int lineNum = sc.nextInt();

			//???????????????
			int[] pliceList = new int[lineNum];
			for (int i = 0; i < pliceList.length; i++) {
				pliceList[i] = sc.nextInt();
			}

			//???????¨????(roop)
			int profit = pliceList[1] - pliceList[0];
			int minplice = pliceList[0];

			for (int i = 1; i < pliceList.length; i++) {
				//?????§???????????´??°
				profit = Math.max(pliceList[i] - minplice, profit);
				//????°????????±???????
				minplice = Math.min(pliceList[i], minplice);

			}
			//????????????
			System.out.println(profit);
		}catch (Exception e) {
			System.out.println(e);
		} finally {
			if (sc != null) {
				sc.close();
			}
		}

	}

}
/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