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

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        int b = scanner.nextInt();
        long time = scanner.nextLong();

        int step = (a + b) / 2;
        long result = power(step, time, 1000000007);
        System.out.println(result);
    }

    static long power(long x, long y, int p) {
        long result = 1;
        x = x % p;
        while (y > 0) {
            if (y % 2 == 1) {
                result = (result * x) % p;
            }
            y = y / 2;
            x = (x * x) % p;
        }
        return result;
    }
}