import java.io.*;
import java.util.*;
import java.math.*;
public class Solution {

     public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BigInteger a = new BigInteger(sc.next());
        BigInteger b = new  BigInteger(sc.next());
        BigInteger t =new  BigInteger(sc.next());
        BigInteger   mid =  a.add(b).divide(new BigInteger("2"));
        BigInteger result =  mid.modPow(t,new BigInteger("1000000007"));
         //String str = result.mod(new BigInteger("1000000007"));
        System.out.println(result);
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
  
}