#include <bits/stdc++.h>
using namespace std;
#define GET_MACRO(a, b, c, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rep2(i, a) rep3 (i, 0, a)
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__)
#define repr2(i, a) repr3 (i, 0, a)
#define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
template<class T1, class T2> inline bool chmin(T1 &a, T2 b) { return b < a && (a = b, true); }
template<class T1, class T2> inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
using ll = long long;

int main() {
	vector<int> num(256);
	rep (i, 26) cin >> num[i + 'a'];

	ll h = num['h'];
	ll e = num['e'];
	ll l = num['l'];
	ll o = num['o'];
	ll w = num['w'];
	ll r = num['r'];
	ll d = num['d'];

	ll ans = 0;

	rep (i, l + 1) rep (j, o + 1) {
		ll cand = h * e * w * r * d;
		cand *= i * (i - 1) / 2;
		cand *= l - i;
		cand *= j;
		cand *= o - j;
		chmax(ans, cand);
	}

	cout << ans << endl;

	return 0;
}