import java.util.Scanner

object Main {
  def main (args: Array[String]) = {
    val in = new Scanner(System.in)
    val a = in.nextInt
    val b = in.nextInt
    val c = in.nextInt

    val div = for (
      i <- 1 to c
      if ((c % i) == 0)
      if (a <= i && b >= i)
    ) yield i

    println(div.length)
  }
}