import java.io.*;
import java.util.*;

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 scan = new Scanner(System.in);
        String[] elements = scan.nextLine().split(" ");
        scan.close();
        int a, b, c;
        long t, m;
        
        a = Integer.parseInt(elements[0]);
        b = Integer.parseInt(elements[1]);
        c = (a+b)/2;
        t = Long.parseLong(elements[2]);
        m = 1000000007;
        
        System.out.print(power(c, t, m));
    }
    
    public static long power(int base, long exponent, long mod){
        if(exponent == 0){
            return 1;
        }
        long recursivePower = power(base, exponent/2, mod)%mod;
        if(exponent%2==0){
            return (recursivePower*recursivePower)%mod;
        }else{
            return (((base*recursivePower)%mod)*recursivePower)%mod;
        }
    }
}