<?php

include 'passport.php';

$passports = explode("\n\n", file_get_contents('input.txt'));
$number_of_valid_passports = 0;

foreach ($passports as $passport) {
    $passport_o = Passport::fromInput($passport);
    $number_of_valid_passports += ($passport_o->isValid()) ? 1 : 0;
}

var_dump($number_of_valid_passports);