import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[200000];
		for (int i = 0; i < n; i++) {
			arr[i] = sc.nextInt();
		}
		int max = Integer.MIN_VALUE;
		int min = arr[0];
		for (int i = 1; i < n; i++) {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		}
		System.out.println(max);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[200000];
		for (int i = 0; i < n; i++) {
			arr[i] = sc.nextInt();
		}
		int max = Integer.MIN_VALUE;
		int min = arr[0];
		for (int i = 1; i < n; i++) {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		}
		System.out.println(max);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[200000];
		for (int i = 0; i < n; i++) {
			arr[i] = sc.nextInt();
		}
		int max = Integer.MIN_VALUE;
		int min = arr[0];
		for (int i = 1; i < n; i++) {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		}
		System.out.println(max);
	} main {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[200000];
		for (int i = 0; i < n; i++) {
			arr[i] = sc.nextInt();
		}
		int max = Integer.MIN_VALUE;
		int min = arr[0];
		for (int i = 1; i < n; i++) {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		}
		System.out.println(max);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int[] arr = new int[200000]; arr new int[200000] 200000 for (int i = 0; i < n; i++) {
			arr[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			arr[i] = sc.nextInt();
		} {
			arr[i] = sc.nextInt();
		} arr[i] = sc.nextInt() arr[i] arr i sc.nextInt() sc.nextInt sc int max = Integer.MIN_VALUE; max Integer.MIN_VALUE Integer Integer.MIN_VALUE int min = arr[0]; min arr[0] arr 0 for (int i = 1; i < n; i++) {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		} int i = 1; int i = 1; i 1 i < n i n i++ i++ i {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		} {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		} max = Math.max(max, arr[i] - min) max Math.max(max, arr[i] - min) Math.max Math max arr[i] - min arr[i] arr i min min = Math.min(min, arr[i]) min Math.min(min, arr[i]) Math.min Math min arr[i] arr i System.out.println(max) System.out.println System.out System System.out max String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[200000];
		for (int i = 0; i < n; i++) {
			arr[i] = sc.nextInt();
		}
		int max = Integer.MIN_VALUE;
		int min = arr[0];
		for (int i = 1; i < n; i++) {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		}
		System.out.println(max);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[200000];
		for (int i = 0; i < n; i++) {
			arr[i] = sc.nextInt();
		}
		int max = Integer.MIN_VALUE;
		int min = arr[0];
		for (int i = 1; i < n; i++) {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		}
		System.out.println(max);
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[200000];
		for (int i = 0; i < n; i++) {
			arr[i] = sc.nextInt();
		}
		int max = Integer.MIN_VALUE;
		int min = arr[0];
		for (int i = 1; i < n; i++) {
			max = Math.max(max, arr[i] - min);
			min = Math.min(min, arr[i]);
		}
		System.out.println(max);
	}
}