import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int number[] = new int[n];
		for (int i = 0; i < n; i++) {
			int x = scanner.nextInt();
			number[i] = x;
		}
		int min = number[0];
		int max = number[1] - number[0];
		for (int i = 1; i < n; i++) {
			if (max < number[i] - min) {
				max = number[i] - min;
			}
			if (min > number[i]) {
				min = number[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