module main;
// https://yang33-kassa.jp/yukicoder/yukicoder073/ より
import std;

void main()
{
	// 入力
	long[char] C;
	foreach (c; lowercase)
		C[c] = readln.chomp.to!long;
	// 答えの計算と出力
	long ans = 1;
	"hewrd".each!(c => ans *= C[c]);
	long O = C['o'], x = (O + 1) / 2;
	ans *= -x * x + O * x;
	long ret = 0, L = C['l'];
	foreach (i; 1 .. L) {
		long leftL = L - i;
		ret = max(ret, i * leftL * (leftL - 1) / 2);
	}
	ans *= ret;
	writeln(ans);
}