fun main() {
    val builder = StringBuilder()

    val n = readInputLine()

    builder.appendLine(
        when (n) {
            "1" -> -1
            "4" -> -1
            else -> {
                if (n.takeLast(2).toInt() % 4 == 2) -1 else 1
            }
        }
    )

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}