import java.util.Scanner;
class Main{
    public static void main(String[]arge){
        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 answer=R[1]-R[0];
        int min=R[0];
        for(int i=1; i<n; i++){
            
            if(answer<R[i] - min)
                answer=R[i]-min;
            if(R[i]<min){
                    min=R[i];
                }
            
            
        }
        System.out.println(answer);
    }
} import java.util.Scanner; Scanner java.util class Main{
    public static void main(String[]arge){
        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 answer=R[1]-R[0];
        int min=R[0];
        for(int i=1; i<n; i++){
            
            if(answer<R[i] - min)
                answer=R[i]-min;
            if(R[i]<min){
                    min=R[i];
                }
            
            
        }
        System.out.println(answer);
    }
} Main public static void main(String[]arge){
        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 answer=R[1]-R[0];
        int min=R[0];
        for(int i=1; i<n; i++){
            
            if(answer<R[i] - min)
                answer=R[i]-min;
            if(R[i]<min){
                    min=R[i];
                }
            
            
        }
        System.out.println(answer);
    } 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 answer=R[1]-R[0];
        int min=R[0];
        for(int i=1; i<n; i++){
            
            if(answer<R[i] - min)
                answer=R[i]-min;
            if(R[i]<min){
                    min=R[i];
                }
            
            
        }
        System.out.println(answer);
    } 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 answer=R[1]-R[0]; answer R[1]-R[0] R[1] R 1 R[0] R 0 int min=R[0]; min R[0] R 0 for(int i=1; i<n; i++){
            
            if(answer<R[i] - min)
                answer=R[i]-min;
            if(R[i]<min){
                    min=R[i];
                }
            
            
        } int i=1; int i=1; i 1 i<n i n i++ i++ i {
            
            if(answer<R[i] - min)
                answer=R[i]-min;
            if(R[i]<min){
                    min=R[i];
                }
            
            
        } {
            
            if(answer<R[i] - min)
                answer=R[i]-min;
            if(R[i]<min){
                    min=R[i];
                }
            
            
        } if(answer<R[i] - min)
                answer=R[i]-min; answer<R[i] - min answer R[i] - min R[i] R i min answer=R[i]-min answer R[i]-min R[i] R i min if(R[i]<min){
                    min=R[i];
                } R[i]<min R[i] R i min {
                    min=R[i];
                } min=R[i] min R[i] R i System.out.println(answer) System.out.println System.out System System.out answer String[]arge arge
import java.util.Scanner;
class Main{
    public static void main(String[]arge){
        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 answer=R[1]-R[0];
        int min=R[0];
        for(int i=1; i<n; i++){
            
            if(answer<R[i] - min)
                answer=R[i]-min;
            if(R[i]<min){
                    min=R[i];
                }
            
            
        }
        System.out.println(answer);
    }
}