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) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt(); int b = in.nextInt(); long t = in.nextLong();
        double numCells = 1;
        for(long i = 0; i < t; i++) {
            numCells = ((double)a/2 + (double)b/2) * numCells;
        }
        System.out.println((int)(numCells % (Math.pow(10, 9) + 7)));
    }
}