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);
        BigInteger a = new BigInteger(in.next());
        BigInteger b = new BigInteger(in.next());
        BigInteger t = new BigInteger(in.next());
        
        BigInteger mod = new BigInteger("10").pow(new Integer("9")).add(new BigInteger("7"));
        
       BigInteger big = new BigDecimal(a.add(b)).multiply(BigDecimal.valueOf(0.5)).toBigInteger().modPow(t,mod);
        
    BigDecimal bd = new BigDecimal(a.add(b));
        
        System.out.println(big);
    }
}