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 in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        int ab = (int) (0.5 * (a+b));
        BigInteger t = new BigInteger(in.next());
        BigInteger count = new BigInteger(String.valueOf(ab));
        BigInteger modVal = new BigInteger("1000000007");
        System.out.println(count.modPow(t, modVal));
    }
}