import java.util.*;
class Main {
	public static void main(String...args) {
		Scanner scan = new Scanner(System.in);
		int times = scan.nextInt();
	    int minValue = scan.nextInt();
		int nowValue = scan.nextInt();
		int dif = nowValue - minValue;
		minValue = Math.min(nowValue,minValue);
		
		for(int i =0; i < times -2; i ++) {
			nowValue = scan.nextInt();
			dif = Math.max(nowValue - minValue , dif);
			minValue = Math.min(nowValue,minValue);
		}
		System.out.println(dif);
	}
}

/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