import java.io.*;

public class Main{
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));
        int n = Integer.parseInt(reader.readLine().trim());
        String[] temp = reader.readLine().split(" ");
        int[] h = new int[n+1];
        for (int i = 0; i < n; i++) {
            h[i] = Integer.parseInt(temp[i]);
        }
        int res = 0;
        for(int i = 0, j = n-1; i < j; ) {
          res = Math.max(res, Math.min(h[i], h[j]) * (j-i));
          if (h[i] < h[j]) i++;
          else j--;
        }
        System.out.println(res);
    }
}