import java.util.Scanner

object Main {
  def main(args: Array[String]): Unit = {
    //nextLineとnextを同時に使ったら死ぬ
    val sc = new Scanner(System.in)

    val n, m = sc.nextLong()

    for (i <- 1L to m/2) {
      println(s"${i * 2 - 1} ${i * 2}")
    }
  }

  @scala.annotation.tailrec
  def gcd(a: Int, b: Int): Int = {
    if (b == 0) a else gcd(b, a % b)
  }
  def debug(args: Any*): Unit = {
    Console.err.println(args.mkString(" "))
  }
}
