import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner cin=new Scanner(System.in);
		
		int n=cin.nextInt();
		
		List<Integer> data=new ArrayList<>();
		
		for(int i=0;i<n;i++)data.add(cin.nextInt());
		
		int res=-2000000000,minv=data.get(0);
		
		for(int i=1;i<n;i++) {
			res=Math.max(res, data.get(i)-minv);
			minv=Math.min(minv, data.get(i));
		}
		System.out.println(res);
	}

}


/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