import java.util.Scanner;

public class Main {

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

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

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