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

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. */
      PrintWriter out = 
            new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)), false);
      Scanner stdin = new Scanner(System.in);
      int a_prob = stdin.nextInt();
      int b_prob = stdin.nextInt();
      BigInteger base = BigInteger.valueOf((a_prob+b_prob)/2);
      BigInteger t = BigInteger.valueOf(stdin.nextLong());
      BigInteger mod = new BigInteger("1000000007");
      
      out.println(base.modPow(t,mod).longValue());
      out.close();
    }
}