#include <stdio.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}

ll cnt[26];

int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	for(int i=0;i<26;i++){
		cin >> cnt[i];
	}
	ll res=0;
	for(ll i=1;i<cnt['l'-'a'];i++){
		for(ll j=1;j<cnt['o'-'a'];j++){
			res=max(res,i*(i-1)/2*(cnt['l'-'a']-i)*j*(cnt['o'-'a']-j)*cnt['h'-'a']*cnt['e'-'a']*cnt['w'-'a']*cnt['d'-'a']*cnt['r'-'a']);
		}
	}
	cout << res << endl;
}