func readInts() -> [Int] {
    return readLine()!.split(separator: " ").map { Int($0)! }
}

func main() {
    let aaa = readInts()
    if aaa[0] + aaa[1] + aaa[2] >= 22 {
        print("bust")
    } else {
        print("win")
    }
}

main()
