object Solution {

    def main(args: Array[String]) {
        val Array(a, b, t) = io.StdIn.readLine.split(" ").map(_.toInt)


        val total = growth(a, b, t, 1) % (Math.pow(10, 9) + 7) toInt
        
        println(total)
    }
    
    @annotation.tailrec
    def growth(a: Int, b: Int, t: Int, cells: Double): Double = t match {
      case 0 => cells
      case _ => growth(a, b, t - 1, 0.5 * a * cells + 0.5 * b * cells)
    }
}