import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int size = scan.nextInt(), min = Integer.MAX_VALUE, max = Integer.MIN_VALUE;
        for(int i = 0; i < size; i++){
            int val = scan.nextInt();
            if(max < val - min) max = val - min;
            if(val < min) min = val;
        }
        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