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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        
        BigInteger a = new BigInteger(in.next());
        BigInteger b = new BigInteger(in.next());
        BigInteger t = new BigInteger(in.next());
        BigInteger d = new BigInteger("2");
        BigInteger mod = new BigInteger("1000000007");
        
        BigInteger growth = (a.add(b).divide(d)).modPow(t,mod); //% (1000000007);
           
   
        System.out.println(growth);
    }
}