using System;
using System.Collections;
using System.Linq;

class Solution {
    private static ulong Pow(ulong b, ulong e, ulong m)
    {
        var a = new BitArray(BitConverter.GetBytes(e));
        int n;
        for (n = a.Count; n >= 0; --n)
        {
            if (a[n - 1])
            {
                break;
            }
        }
        
        ulong result = 1;
        for (var i = 0; i < n; ++i)
        {
            if (a[i])
            {
                result *= Pow2(b, i, m);
                result %= m;
            }
        }
        
        return result;
    }
    
    private static ulong Pow2(ulong b, int c, ulong m)
    {
        ulong result = b;
        for (var i = 0; i < c; ++i)        
        {
            result *= result;
            result %= m;
        }
        
        return result;
    }
    
    static void Main(String[] args)
    {
        var input = Console.ReadLine().Split().Select(ulong.Parse).ToArray();
        var a = input[0];
        var b = input[1];
        var t = input[2];

        var modulo = (ulong)Math.Pow(10, 9) + 7;
        var count = Pow((a + b) / 2, t, modulo);
        
        Console.WriteLine(count);
    }
}