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

public class Solution {

    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 scan = new Scanner(System.in);
        String line = scan.nextLine();
        String[] s = line.split(" ",3);
        
        int a = Integer.parseInt(s[0]);
        int b = Integer.parseInt(s[1]);
        
        BigInteger t = new BigInteger(s[2]);
        
        double avg = 0.5*(a+b);
        
        BigInteger big_avg = new BigInteger(Integer.toString((int)avg));
        BigInteger mod = new BigInteger("1000000007");
        
        BigInteger result;
        
        result = big_avg.modPow(t,mod);
        
        System.out.println(result);

    }
}