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


@main def main =
  val n = readLine.toInt
  val Array(a, b, c) = readLine.split(' ').map(_.toInt)
  if a < b then
    println(if a < c then "Yes" else "No")
  else
    println(if c < a then "Yes" else "No")