using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Numerics;
class Solution {
    static void Main(String[] args) {
        var numbers = Console.ReadLine().Split(' ').Select(long.Parse).ToArray();
        var a = numbers[0];
        var b = numbers[1];
        var t = numbers[2];

        var factor = (a + b) / 2;
        var modulus = new BigInteger(1000000007L);

        var result = BigInteger.ModPow(factor, t, modulus);

        Console.WriteLine(result);
    }
}