fun main() {
    val a = nextInt()
    println(a+(a*a)+(a*a*a))
}

fun next() = readLine()!!
fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextDouble() = next().toDouble()
fun nextList() = next().split(' ')
fun nextIntList() = nextList().map { it.toInt() }
fun nextLongList() = nextList().map { it.toLong() }
fun nextDoubleList() = nextList().map { it.toDouble() }
