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

public class Solution {

    public static long power(long x, long y, long p) {
        long res = 1;
        x = x%p;
        while (y > 0) {
        // If y is odd, multiply x with result
            if (y%2!=0)
                res = (res*x) % p;
 
        // y must be even now
        y = y/2;
        x = (x*x) % p;  
        }
        return res;
    }
    
    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner s = new Scanner(System.in);
        long a = s.nextLong();
        long b = s.nextLong();
        long t = s.nextLong();
        long k= (a+b)/2;
        long output = power(k,t,1000000007);
        System.out.println(output);
        
    }
}