import Foundation

struct Equation {
    let left: Int
    let right: [Int]

    init(from s: String) {
        let split = s.split(separator: " ")
        left = Int(split[0].filter { $0 != ":" })!
        right = split.dropFirst().map { Int($0)! }
    }

    func valid(with ops: [(Int, Int) -> Int]) -> Bool {
        if ops.count != right.count - 1 {
            return false
        }
        return left == ops.enumerated().reduce(right[0], { acc, op in
            op.1(acc, right[op.0+1]) 
        })
    }
}

func readInput(_ filePath: String) throws -> [Equation] {
    let content = try String(contentsOfFile: filePath, encoding: .ascii)
    return content.split(separator: "\n").map { Equation(from: String($0)) }
}

func combo<T>(of symbols: [T], len: Int) -> [[T]] {
    if len == 0 {
        return [[]]
    }
    let cdrs = combo(of: symbols, len: len - 1)
    return symbols.flatMap { s in cdrs.map { cdr in [s] + cdr } }
}

let op: [(Int, Int) -> Int] = [(+), (*)]
let eqs = try readInput(CommandLine.arguments[1])
let answer = eqs
    .filter { eq in
        combo(of: op, len: eq.right.count - 1).contains { eq.valid(with: $0) }
    }.reduce(0, { s, eq in s + eq.left })
print(answer)