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 in = new Scanner(System.in);
        
        int a;
        int b;
     
        
        a = in.nextInt();
        b = in.nextInt();
        BigInteger t = in.nextBigInteger();
        BigInteger p = new BigInteger(String.valueOf((a+b)/2));
        BigInteger f = p.modPow(t, new BigInteger("1000000007"));
        System.out.print(f.toString());
        
        
        
    }
}