object Main {
  def main(args: Array[String]): Unit = {
    val lines = io.Source.stdin.getLines().toSeq
    println(solve(lines))
  }

  def solve(lines: Seq[String]): String = {
    val Array(a, b, t) = lines.head.split(" ").map(_.toInt)
    var biscuits = 0
    for (i <- a until (t + 1) by a) {
      biscuits += b
    }
    biscuits.toString
  }
}
