using System;
using System.Collections.Generic;
using System.IO;
using System.Numerics;
class Solution 
{
    static void Main(String[] args) 
    {
        string[] strArray = Console.ReadLine().Split(' ');
            float a = float.Parse(strArray[0]);
            float b = float.Parse(strArray[1]);
            long t = long.Parse(strArray[2]);
            long mod = 1000000007;
            Console.WriteLine(BigInteger.ModPow((BigInteger) (0.5 * a + 0.5 * b), t, mod));
    }
}