import scala.io.StdIn
import scala.collection.mutable.ArrayBuffer

object Main {
  def main(args: Array[String]): Unit = {
    var n = StdIn.readLong

    val memo = ArrayBuffer[Int]()

    for (i <- (2 to Math.sqrt(n).toInt + 1)) {
      while (n % i == 0) {
        memo += i
        n /= i
      }
    }

    if (n != 1) {
      memo += n.toInt
    }

    println(
      if (memo.size > 2) "YES" else "NO"
    )
  }
}