import java.io.*;
import java.util.*;
import java.math.*;
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 s=new Scanner(System.in);
        int a=s.nextInt();
        int b=s.nextInt();
        long t=s.nextLong();
        int in=(a+b)/2;
        BigInteger int1=new BigInteger(String.valueOf(in));
        BigInteger mod=new BigInteger("1000000007");
        BigInteger tim=new BigInteger(String.valueOf(t));
        BigInteger big1=int1.modPow(tim,mod);
        System.out.println(big1);
    }
}