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

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        int b = scan.nextInt();
        int t = scan.nextInt();
        
        BigInteger ans = calculate(a + b, t);
        double ans2 = Math.pow(0.5, t);
        System.out.println((int) (ans.doubleValue() * ans2));
    }
    
    public static BigInteger calculate(int num, int t) {
        BigInteger ans = BigInteger.valueOf(num);
        return ans.modPow(BigInteger.valueOf(t), BigInteger.valueOf((long) Math.pow(10, 9) + 7));
    }
}