#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>

using namespace std;

int main() {
	int c;

	vector<int> alpha(26, 0);
	for (int i = 0; i < 26; i++) {
		cin >> c;
		alpha[i] = c;
	}

	//helloworld

	long long ans;
	// l 2 1
	int nl = alpha['l' - 'a'];
	int max_l = 0;
	for (int i = 2; i <= nl - 1; i++) {
		max_l = max(max_l, i * (i - 1) / 2 * (nl - i));
	}
	ans = max_l;
	// o 1 1
	int no = alpha['o' - 'a'];
	ans *= no / 2 * (no - no / 2);
	ans *= alpha['h' - 'a'];
	ans *= alpha['e' - 'a'];
	ans *= alpha['w' - 'a'];
	ans *= alpha['r' - 'a'];
	ans *= alpha['d' - 'a'];

	cout << ans << endl;
	return 0;
}