int main() {
  long long a[26];
  for(int i = 0; i < 26; ++i) scanf("%lld", &a[i]);

  long long ans = 1;
  ans *= a['h' - 'a'];
  ans *= a['e' - 'a'];
  ans *= a['w' - 'a'];
  ans *= a['d' - 'a'];

  ans *= a['o' - 'a'] * a['o' - 'a'] / 4;

  long long l = 0;
  for (int i = 2; i < a['l' - 'a']; ++i) {
    long long left = i * (i - 1) / 2;
    long long right = a['l' - 'a'] - i;
    if (left * right > l) l = left * right;
  }
  ans *= l;
  printf("%lld\n", ans);
}