#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = (n)-1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
template<class T> void chmax(T& a, const T& b) {a = max(a, b);}
template<class T> void chmin(T& a, const T& b) {a = min(a, b);}
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll c[26];
    rep(i, 26) cin >> c[i];
    ll ans = c['h'-'a'] * c['e' - 'a'] * c['w' - 'a'] * c['r' - 'a'] * c['d' - 'a'];
    ll o = c['o' - 'a'];
    ans *= o / 2 * (o - o / 2);
    ll l = c['l' - 'a'];
    int t = 0;
    rep(i, l) {
        int j = l - i;
        chmax(t, i * (i - 1) / 2 * j);
    }
    ans *= t;
    cout << ans << endl;
}