import java.util.Scanner;


public class Main_yukicoder73 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        long[] c = new long[26];
        for (int i = 0; i < 26; i++) {
        	c[i] = sc.nextLong();
        }

        long ret = c['h' - 'a'] * c['e' - 'a'] * c['w' - 'a'] * c['r' - 'a'] * c['d' - 'a'];
        long tmp = c['o' - 'a'] / 2;
        ret *= (c['o' - 'a'] - tmp) * tmp;

        long max = 0;
        for (long l = 1; l <= c['l' - 'a']; l++) {
        	max = Math.max(max, ret * (c['l' - 'a'] - l) * (c['l' - 'a'] - l - 1) / 2 * l);
        }

		System.out.println(max);
        
        sc.close();
    }
}