import java.util.Scanner;

public class Main {
    public static void main(String[] p) {
        Scanner q = new Scanner(System.in);
        String str = q.next();
        int a = 0;

        for (int i = 0; i < str.length();) {
            if (i + 4 < str.length() && "hamu".equals(str.substring(i, i + 4))) {
                a <<= 1;
                i += 4;
            } else {
                a <<= 0;
                i += 3;
            }
        }
        System.out.println(a);
    }
}