import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) throws Exception {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String input = in.readLine();
        String is[] = input.split(" ");
        long a = Long.parseLong(is[0]);
        long b = Long.parseLong(is[1]);
        long t = Long.parseLong(is[2]);
        
        //double x = ((a+b)/2);
        //double res = Math.pow(x, t);
        //System.out.println((long)(res % (Math.pow(10, 9) + 7)));
        
        long p = (long)(Math.pow(10, 9) + 7);
        
        long x = (long)((a+b)/2);
        long res = 1;
        while(t > 0) {
            if((t & 1) != 0) //t is odd
                res = (res*x) % p;
 
            //t even
            t = t>>1; // t = t/2
            x = (x*x) % p;  
        }
        

        System.out.println(res);
    }
}