import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n];
		for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		}

		int min = a[0];
		int ans = -1001001001;
		for(int i = 1 ; i < n ; i++) {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[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[] a = new int[n];
		for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		}

		int min = a[0];
		int ans = -1001001001;
		for(int i = 1 ; i < n ; i++) {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[i]);
		}
		System.out.println(ans);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n];
		for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		}

		int min = a[0];
		int ans = -1001001001;
		for(int i = 1 ; i < n ; i++) {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[i]);
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n];
		for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		}

		int min = a[0];
		int ans = -1001001001;
		for(int i = 1 ; i < n ; i++) {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[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[] a = new int[n]; a new int[n] n for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		} int i = 0 ; int i = 0 ; i 0 i < n i n i++ i++ i {
			a[i] = sc.nextInt();
		} {
			a[i] = sc.nextInt();
		} a[i] = sc.nextInt() a[i] a i sc.nextInt() sc.nextInt sc int min = a[0]; min a[0] a 0 int ans = -1001001001; ans -1001001001 1001001001 for(int i = 1 ; i < n ; i++) {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[i]);
		} int i = 1 ; int i = 1 ; i 1 i < n i n i++ i++ i {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[i]);
		} {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[i]);
		} ans = Math.max(ans, a[i] - min) ans Math.max(ans, a[i] - min) Math.max Math ans a[i] - min a[i] a i min min = Math.min(min, a[i]) min Math.min(min, a[i]) Math.min Math min a[i] a 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[] a = new int[n];
		for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		}

		int min = a[0];
		int ans = -1001001001;
		for(int i = 1 ; i < n ; i++) {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[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[] a = new int[n];
		for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		}

		int min = a[0];
		int ans = -1001001001;
		for(int i = 1 ; i < n ; i++) {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[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[] a = new int[n];
		for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		}

		int min = a[0];
		int ans = -1001001001;
		for(int i = 1 ; i < n ; i++) {
			ans = Math.max(ans, a[i] - min);
			min = Math.min(min, a[i]);
		}
		System.out.println(ans);
	}
}