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);
        String line = in.nextLine();
        String [] parts = line.split(" ");
        String modS = "1000000007";
        BigInteger modB = new BigInteger(modS);
        
        float a = Float.parseFloat(parts[0]);
        float b = Float.parseFloat(parts[1]);
        BigInteger t = new BigInteger(parts[2]);
        //double module = Math.pow(10, 9)+7;
        
        BigInteger divVal = new BigInteger("10000");
        int multiplier =(int) (0.5 * (a + b)*10000);
        String multS = Integer.toString(multiplier);
        BigInteger multB = new BigInteger(multS); 
        multB = multB.divide(divVal);
        
        BigInteger res = multB.modPow(t, modB);// power(multB.intValue(), t.intValue());//multB.pow(t.intValue());
        //res = res.mod(modB);
        
        System.out.println(res.intValue());

    }
}