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 scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        int b = scanner.nextInt();
        BigInteger bigT = new BigInteger(scanner.next());
        BigInteger integer = new BigInteger(String.valueOf((a+b)/2));
        BigInteger mod = new BigInteger("1000000007");
        System.out.println(integer.modPow(bigT, mod).toString());
    }
}