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);
        BigInteger a = new BigInteger(scan.next());
        BigInteger b = new BigInteger(scan.next());
        BigInteger t = new BigInteger(scan.next());
        scan.close();
        BigInteger answer = new BigInteger("0");
        answer = answer.add(a);
        answer = answer.add(b);
        answer = answer.divide(new BigInteger("2"));
        answer = answer.modPow(t, new BigInteger("1000000007"));
        System.out.println(answer.toString());
    }
}