Решение

import java.io.BufferedReader
import java.io.BufferedWriter
import java.io.InputStreamReader
import java.io.OutputStreamWriter

fun main() {
    val reader = BufferedReader(InputStreamReader(System.`in`))
    val writer = BufferedWriter(OutputStreamWriter(System.out))

    val N = reader.readLine().toLong()
    reader.close()

    val result = N * (N + 2) * (2 * N + 1) / 8

    writer.write(result.toString())
    writer.newLine()
    writer.close()
}