#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    vector<int> c(128);
    for(char a='a'; a<='z'; ++a)
        cin >> c[a];

    int n = c['l'];
    long long ret = 0;
    for(long long i=2; i<n; ++i)
        ret = max(ret, (i * (i - 1) / 2) * (n - i));

    ret *= (c['o'] / 2) * ((c['o'] + 1LL) / 2);
    ret *= (long long)c['h'] * c['e'] * c['w'] * c['r'] * c['d'];
    cout << ret << endl;

    return 0;
}