




import 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 max = Integer.MIN_VALUE;
        int min = a[0];
        for(int i = 1; i < N; i++){
            max = Math.max(max, a[i] - min);
            min = Math.min(min, a[i]);

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

        }
        System.out.println(max); 



    }   
} 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 max = Integer.MIN_VALUE;
        int min = a[0];
        for(int i = 1; i < N; i++){
            max = Math.max(max, a[i] - min);
            min = Math.min(min, a[i]);

        }
        System.out.println(max); 



    } 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 max = Integer.MIN_VALUE;
        int min = a[0];
        for(int i = 1; i < N; i++){
            max = Math.max(max, a[i] - min);
            min = Math.min(min, a[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 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 max = Integer.MIN_VALUE; max Integer.MIN_VALUE Integer Integer.MIN_VALUE int min = a[0]; min a[0] a 0 for(int i = 1; i < N; i++){
            max = Math.max(max, a[i] - min);
            min = Math.min(min, a[i]);

        } int i = 1; int i = 1; i 1 i < N i N i++ i++ i {
            max = Math.max(max, a[i] - min);
            min = Math.min(min, a[i]);

        } {
            max = Math.max(max, a[i] - min);
            min = Math.min(min, a[i]);

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

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

        }
        System.out.println(max); 



    }   
}





