/* -*- coding: utf-8 -*-
 *
 * 73.cc: No.73 helloworld - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

typedef long long ll;

/* global variables */

int cs[26];

/* subroutines */

inline int alphcs(char a) { return cs[a - 'a']; }

/* main */

int main() {
  for (int i = 0; i < 26; i++) cin >> cs[i];

  int csl = alphcs('l'), cso = alphcs('o');
  if (csl < 3 || cso < 2) {
    puts("0");
    return 0;
  }

  ll maxlcnt = 1, maxocnt = 1;
  for (int i = 2, j = csl - 2; j >= 1; i++, j--) {
    ll lcnt = (ll)i * (i - 1) / 2 * j;
    if (maxlcnt < lcnt) maxlcnt = lcnt;
  }
  for (int i = 1, j = cso - 1; j >= 1; i++, j--) {
    ll ocnt = (ll)i * j;
    if (maxocnt < ocnt) maxocnt = ocnt;
  }

  ll cnt =
    maxlcnt * maxocnt *
    alphcs('h') * alphcs('e') * alphcs('w') * alphcs('r') * alphcs('d');

  printf("%lld\n", cnt);
  return 0;
}