object Solution {

    def main(args: Array[String]) {
            val sc = new java.util.Scanner(System.in)
    val a = sc.nextInt()
    val b = sc.nextInt()
    val t = BigInt(sc.next())

    println(BigInt((0.5*a + 0.5*b).toInt).modPow(t, 1000000007))
    }
}