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) throws IOException  {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String line = in.readLine();
        String[] parts = line.split(" ");
        int a = Integer.parseInt(parts[0]);
        int b = Integer.parseInt(parts[1]);
        BigInteger base = new BigInteger( String.valueOf((a + b)/2) );
        BigInteger t = new BigInteger(parts[2]);
        BigInteger m = new BigInteger( "1000000007" );
        BigInteger res = base.modPow( t, m );
        System.out.println(res);
    }
}