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

public class Solution {
    
    public static long my_pow(int nr, long pow){
        long mod =(long) Math.pow(10,9) + 7;
        if(pow == 1){
            return nr;
        }
        if(pow % 2 == 0){
            long rez = my_pow(nr, pow/2) % mod;
            return rez * rez % mod;
        } else{
            return nr * my_pow(nr, pow - 1) % mod;
        }

    }

    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 sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        long t = sc.nextLong();
        
        System.out.println(my_pow(((a+b)/2), t));
    }
}