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 scan = new Scanner(System.in);
        int a = scan.nextInt();
        int b = scan.nextInt();
        long t1 = scan.nextLong();
        double t = (double)t1;
        double factor,cells;
        
        factor = ((((0.5)*a)+((0.5)*b))%(1000000007));
        cells = Math.pow(factor,t);
        cells = cells%1000000007;
        System.out.println((long)cells);
       }
}