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

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);
        int a = scan.nextInt();
        int b = scan.nextInt();
        String t = scan.next();
        
        BigInteger ans;
        
        int ave = (a+b) / 2;
        String average = Integer.toString(ave);
        BigInteger exponent = new BigInteger(t);
        BigInteger base = new BigInteger(average);
        BigInteger mod = new BigInteger("1000000007");
        
        ans = base.modPow(exponent, mod);
        
        
        System.out.println(ans);
    }
}