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

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 input = new Scanner(System.in);
		long a = input.nextInt();
		long b = input.nextInt();
		long t = input.nextLong();
		input.close();
		Long time = new Long(t);
		BigInteger spread = BigInteger.valueOf(time);
		BigInteger modulus = new BigInteger("1000000007");
		BigInteger values = BigInteger.valueOf((a+b)/2);
		BigInteger result = values.modPow(spread, modulus);
		
		BigInteger fResult = result.mod(modulus);
		
		System.out.print(fResult);
    }
}