import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int[] arr=new int[n];
        for(int i=0;i<n;i++){
            arr[i]=sc.nextInt();
        }
        int left=0,right=n-1;
        int max_area=0;
        while (left<right) {
            int h=arr[left];
            int w=arr[right];
            int area=Math.min(h,w)*(right-left);
             max_area=Math.max(area,max_area);
            if(arr[left]<arr[right]) left++;
            else right--;
        }
        System.out.println(max_area);
    }

    
}