#!/usr/bin/env python3

# Advent Of Code 2020 - Day 2

"""
1-5 k: kkkkhkkkkkkkkkk
5-7 k: blkqhtxfgktdkxzkksk
"""

filename = "input.txt"

with open(filename) as f:
    content = f.readlines()

validPasswords = 0

for i in content:
    line = i.split()
    
    xMin = int(line[0].split("-")[0])
    xMax = int(line[0].split("-")[1])

    character = line[1].rstrip(":")

    password = line[2]

    if ( xMin <= password.count(character) <= xMax ):
        validPasswords = validPasswords + 1

print (validPasswords)