using System;
using System.Collections.Generic;
using System.IO;
using System.Numerics;

class Solution {
    static void Main(String[] args) {
        string[] arr_temp = Console.ReadLine().Split(' ');
        Int64[] arr = Array.ConvertAll(arr_temp,Int64.Parse);
        Int64 a = arr[0];
        Int64 b = arr[1];
        Int64 t = arr[2];
        Console.WriteLine(Expected(a, b, t));
    }
    
    static int Expected(Int64 a, Int64 b, Int64 t){        
        BigInteger multiplier = new BigInteger(0.5 * (a + b));
        BigInteger modulus = new BigInteger(1000000007);
        BigInteger expected = BigInteger.ModPow(multiplier, t, modulus);
        
        return (int) expected;
    }
}