#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-9;
const ll mod=1e6+7;
const int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};

ll a[26];

int main(){
	for(int i=0;i<26;i++) cin>>a[i];
	ll X=a['o'-'a'],Y=a['l'-'a'];
	ll t=a['h'-'a']*a['e'-'a']*a['w'-'a']*a['r'-'a']*a['d'-'a']*(X/2)*(X-X/2),res=0;
	for(int i=0;i<=Y;i++) res=max(res,i*(i-1)/2*t*(Y-i));
	cout<<res<<endl;
}