import scala.collection.mutable
import scala.collection.mutable.ArrayBuffer
import scala.io.StdIn.*
import scala.util.chaining.*
import scala.math.*
import scala.util._


@main def main =
  val n = readLine.toInt
  val result = ArrayBuffer[List[Int]]()
  result.addOne((n until 2 * n).toList.reverse)
  result.addOne((n until 2 * n).toList.reverse)
  for i <- 0 until n - 1 do
    var list = List(n - 1)
    for j <- 0 until n do
      if i != j then
        list ::= n + j
    result.addOne(list)
  for i <- 1 to n - 2 do
    var list = Nil: List[Int]
    for j <- n - 1 - i until n - 1 do
      list ::= j
    for j <- 2 * n - (n - i) until 2 * n  do
      list ::= j
    result.addOne(list)
  println(result.size)
  println(result.map(_.mkString(" ")).mkString("\n"))