import java.util.*;

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

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