import Foundation

func readInput(_ filePath: String) throws -> ([Int: Set<Int>], [[Int]]) {
    let content = try String(contentsOfFile: filePath, encoding: .ascii)
    var rules: [Int: Set<Int>] = [:]
    var pages: [[Int]] = []
    var readingRules = true
    for l in content.split(separator: "\n", omittingEmptySubsequences: false) {
        if l == "" {
            readingRules = false
            continue
        }
        if readingRules {
            let rule = l.split(separator: "|").map { Int($0)! }
            let (before, after) = (rule[0], rule[1])
            let current = rules[before, default: []]
            rules[before] = current.union([after])
        } else {
            pages.append(l.split(separator: ",").map { Int($0)! })
        }
    }
    return (rules, pages)
}

func goodPages(_ pages: [Int], against rules: [Int: Set<Int>]) -> Bool {
    var seen: Set<Int> = []
    for page in pages {
        if !rules[page, default: []].isDisjoint(with: seen) {
            return false
        }
        seen.insert(page)
    }
    return true
}

let (rules, manuals) = try readInput(CommandLine.arguments[1])
let answer = manuals
    .filter { goodPages($0, against: rules) }
    .map { $0[$0.count/2] }.reduce(0, +)
print(answer)