#include "bits/stdc++.h"
using namespace std;

int n[26];
int g(char c){
	return n[c - 'a'];
}

long long calcl(int a){
	int ret = 0;
	for (int i = 2; i < a; i++)
	{
		ret = max(ret, (i*(i - 1) / 2) * (a - i));
	}
	return ret;
}

int main(){
	for (int i = 0; i < 26; i++) cin >> n[i];
	cout << (long long)g('h')*g('e')*g('w')*g('r')*g('d')*(g('o') / 2)*((g('o') + 1) / 2)* calcl(g('l')) << endl;
}