#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  const Int n = 26;
  vector<Int> c(n);
  for(Int i=0;i<n;i++) cin>>c[i];
  auto calc=[&](char x){return c[x-'a'];};
  
  Int ans=0;
  for(Int i=0;i<=calc('l');i++)
    for(Int j=0;j<=calc('o');j++)
      chmax(ans,(i*(i-1)/2)*(calc('l')-i)*j*(calc('o')-j));

  ans*=calc('h')*calc('e')*calc('w')*calc('r')*calc('d');  
  cout<<ans<<endl;
  return 0;
}