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();
        long t = scan.nextLong();
        
        
        BigInteger base = BigInteger.valueOf((a+b)/2);
        BigInteger mod = BigInteger.valueOf((long) Math.pow(10, 9) + 7);
        BigInteger ans = base.modPow(BigInteger.valueOf(t), mod);
        long answer = (long) (Math.pow((a+b)/2, t) % (Math.pow(10, 9) + 7)); 
      
        System.out.println(ans.toString());
    }
}