<?php

$lines = explode("\n", file_get_contents('./input.txt'));

$scores = [
    ')' => 3,
    ']' => 57,
    '}' => 1197,
    '>' => 25137,
];

$corrupted = [];

foreach ($lines as $line) {
    $chunks = [];
    foreach (str_split($line) as $chunk) {
        switch ($chunk) {
            case '(': $chunks[] = ')';break;
            case '[': $chunks[] = ']';break;
            case '{': $chunks[] = '}';break;
            case '<': $chunks[] = '>';break;
            default:
                $last_chunk = array_pop($chunks);
                if ($last_chunk !== $chunk) {
                    $corrupted[] = $chunk;
                }
        }
    }
}

echo array_sum(array_map(static function ($score) use ($scores) {
    return $scores[$score];
}, $corrupted));