#!/usr/bin/env python

import os

dirs = os.listdir("./data/")
LIST = []
for f in dirs:
    with open("data/"+f) as f:
        data = f.readlines()
        if len(data) != 1:
            raise Exception("multiple line file?! ")

        data = data[0].split("<td  width=\"33%\">")[1:]
        for i,d in enumerate(data):
            if i%2==1:
                LIST.append(d[:d.find("</td>")])


print(len(LIST))