using System;

class Solution 
{
    static int T = 1000000007;
    
    static void Main(String[] args) 
    {
        string[] tokens = Console.ReadLine().Split(' ');
        int a = int.Parse(tokens[0]);
        int b = int.Parse(tokens[1]);
        long t = long.Parse(tokens[2]) % (T - 1);
        
        long cells = 1;
        long x = (long)((a + b) / 2);
        
        while (t > 0)
        {
            if (t % 2 > 0)
            {
                cells = (x * cells) % T;
                t = (t - 1) / 2;
            }
            else
            {
                t = t / 2;
            }
            
            x = (x * x) % T;
        }
        
        Console.WriteLine(cells);
    }
}