using System.Collections.Generic;
using static System.Math;
using System;

public class Hello
{
     static void Main()
    {
        var ap = "abcdefghijklmnopqrstuvwxyz";
        var d = new Dictionary<char, int>();
        for (int i = 0; i < 26; i++)
           d[ap[i]] = int.Parse(Console.ReadLine().Trim());
        var hw = "hewrd";
        var ans = 1L;
        foreach (var x in hw)
        {
            ans *= d[x];
            if (ans == 0) { Console.WriteLine(0); goto exit; }
        }
        ans *= getL(d['l']);
        if (ans == 0) { Console.WriteLine(0); goto exit; }
        ans *= getO(d['o']);
        if (ans == 0) { Console.WriteLine(0); goto exit; }
        Console.WriteLine(ans);
        exit:;
    }
    static int getO (int n)
    {
        if (n < 2) return 0;
        return n / 2 * (n - n / 2);
    }
    static int getL (int n)
    {
        if (n < 3) return 0;
        var ans = 0;
        for (int i = 2; i <= n -1; i++)
        {
            var w = (i * (i - 1)) / 2 * (n - i);
            ans = Max(ans, w);
        }
        return ans;
    }
}