#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  vector<int> cnt(26, 0);
  rep(i, 26) cin >> cnt[i];
  auto f = [&](char c) -> int {
    return cnt[c - 'a'];
  };
  // h e ll o w o r l d
  // hewrd lll oo
  ll ans = 0;
  for (int x = 1; x < f('o'); ++x) {
    for (int y = 1; y < f('l'); ++y) {
      ans = max(ans, 1LL * f('h') * f('e') * f('w') * f('r') * f('d') * x * (f('o') - x) * y * (y - 1) / 2 * (f('l') - y));
    }
  }
  cout << ans << endl;
  return 0;
}