
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int minv = Integer.MAX_VALUE;
		int maxv = Integer.MIN_VALUE;
		for (int i = 0; i < n; i++) {
			int j = scanner.nextInt();
			if (i > 0)
				maxv = Math.max(maxv, j - minv);
			minv = Math.min(minv, j);
		}
		System.out.println(maxv);
	}
}
/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