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#!/usr/local/bin/node
//
// See ../README.md
//
//
// Run as: node ch-2.js < input-file
//
let first_line = 1
let arrivals = []
let departures = []
require ('readline')
. createInterface ({input: process . stdin})
. on ('line', line => {
let times = line . match (/[0-9][0-9]:[0-9][0-9]/g)
. map (_ => _ . split (/:/) . map (_ => +_))
. map (_ => 60 * _ [0] + _ [1])
if (first_line) {
arrivals = times
first_line = 0
}
else {
departures = times
}
})
. on ('close', () => {
let trains = []
for (i = 0; i < 24 * 60; i ++) {
trains [i] = 0
}
arrivals . forEach ((arrival, index) => {
let departure = departures [index]
for (i = arrival; i <= departure; i ++) {
trains [i] ++
}
if (arrival > departure) {
for (i = 0; i <= departure; i ++) {
trains [i] ++
}
for (i = arrival; i < 24 * 60; i ++) {
trains [i] ++
}
}
})
console . log (Math . max (... trains))
})
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