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 sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        BigInteger t = sc.nextBigInteger();
        BigInteger mod = new BigInteger("1000000007");
        sc.close();
        int r = (a+b)/2;
        BigInteger bi = BigInteger.valueOf(r);
        System.out.println(bi.modPow(t, mod));
    }
}