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

public class Hii {

    public static void main(String[] args) throws Exception{

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line[] = br.readLine().split(" ");
        BigInteger res = new BigInteger("0");
        BigInteger b1,b2,b3,modu;
        modu = new BigInteger("1000000007"); 
        // public BigInteger modPow(BigInteger exponent, BigInteger m)
        
        
        b1 = new BigInteger(line[0]);
        b2 = new BigInteger(line[1]);
        b3 = new BigInteger(line[2]);
        //b1 = b1.modPow(b3,modu);
        //b2 = b2.modPow(b3,modu);
        
        res = (b1.add(b2)).mod(modu);
        res = res.divide(new BigInteger("2"));
        
        res = res.modPow(b3,modu);
        System.out.println(res.toString());
        
    
    }
}