import java.io.*;
import java.util.*;
import java.math.BigInteger;

public class Solution {
    
    public static void main(String[] args) throws Exception {
       
        Scanner in = new Scanner(System.in);
        
        int a = in.nextInt();
        int b = in.nextInt();
        
        BigInteger t =  new BigInteger(in.next());

        int temp = (a+b)/2;
        BigInteger mod = new BigInteger("1000000007");
        BigInteger v = new BigInteger(Integer.toString(temp));
        
        System.out.println(v.modPow(t, mod));

    }
}