#include <algorithm>
#include <iostream>
#include <cstdio>
#include <map>
#include <numeric>
#include <cmath>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <queue>
#include <stack>
#include <complex>
#include <string.h>
#include <unordered_set>
#include <unordered_map>
#include <iomanip>
#include <sys/time.h>
#include <random>
using namespace std;

#define endl '\n'
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define uniq(v) (v).erase(unique((v).begin(), (v).end()), (v).end())

typedef long long ll;
typedef long double lb;
typedef pair<int, int> P;
typedef complex<double> comp;
typedef vector< vector<lb> > matrix;
struct pairhash {
public:
    template<typename T, typename U>
    size_t operator()(const pair<T, U> &x) const {
	size_t seed = hash<T>()(x.first);
	return hash<U>()(x.second) + 0x9e3779b9 + (seed<<6) + (seed>>2);
    }
};
const int inf = 1e9 + 9;
const ll mod = 1e9 + 7;
const double eps = 1e-8;
const double pi = acos(-1);

ll c[26];

ll solve() {
    ll l = 0, o = 0;
    for (ll i = 0; i <= c['l'-'a']; i++)
        l = max(l, i * (i-1) / 2 * (c['l'-'a']-i));
    for (ll i = 0; i <= c['o'-'a']; i++)
        o = max(o, i * (c['o'-'a']-i));
    return c['h'-'a'] * c['e'-'a'] * c['w'-'a'] * c['d'-'a'] * c['r'-'a'] * l * o;
}

void input() {
    for (int i = 0; i < 26; i++)
        cin >> c[i];
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(15);

    input();
    cout << solve() << endl;
}