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

func main() {
    let ab = readInts()
    let a = ab[0]
    let b = ab[1]
    
    print([a + b, a - b, a * b].sorted(by: >)[0])
}

main()
