using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text;

public class Program
{

    public void Proc()
    {
        Dictionary<char, int> cnt = new Dictionary<char, int>();
        for (char c = 'a'; c <= 'z'; c++) {
            cnt.Add(c, int.Parse(Reader.ReadLine()));
        }

        string word = string.Join(string.Empty, "helloworld".Distinct());
        long ans = 1;
        for (int i = 0; i < word.Length; i++) {
            if(word[i] == 'l') {
                if(cnt[word[i]]<3) {
                    ans = 0;
                    break;
                }
                long tmp = cnt[word[i]] - 3;
                long tmp2 = 1;
                for (int j = 1; j <= tmp; j++) {
                    long l1 = 2 + j;
                    long l2 = 1 + tmp - j;
                    long l3 = 2 + tmp - j;
                    long l4 = 1 + j;
                    tmp2 = Math.Max(tmp2, l1 * (l1 - 1) / 2 * l2);
                    tmp2 = Math.Max(tmp2, l3 * (l3 - 1) / 2 * l4);
                }
                ans = ans * tmp2;
            } else if(word[i]=='o') {
                long tmp = cnt[word[i]] / 2 * (cnt[word[i]] - cnt[word[i]] / 2);
                ans = ans * tmp;
            } else {
                ans = ans * (cnt[word[i]]);
            }
        }
        Console.WriteLine(ans);
    }




	public class Reader
	{
		private static StringReader sr;
		public static bool IsDebug = false;
		public static string ReadLine()
		{
			if (IsDebug)
			{
				if (sr == null)
				{
					sr = new StringReader(InputText.Trim());
				}
				return sr.ReadLine();
			}
			else
			{
				return Console.ReadLine();
			}
		}
		private static string InputText = @"


0
0
0
1
1
0
0
1
0
0
0
4
0
0
3
0
0
1
0
0
0
0
1
0
0
0


";
	}

	public static void Main(string[] args)
	{
#if DEBUG
		Reader.IsDebug = true;
#endif
		Program prg = new Program();
		prg.Proc();
	}
}