#include <iostream>
using namespace std;

int pow(unsigned x, unsigned long y, unsigned long M, int res = 1) {
	x = x % M;  // reduce and update x if appropriate

	while (y) {
		if (y & 1)
			// res = (res * x) % M;
			res = ((res % M) * (x % M)) % M;

		y >>= 1;
		x = ((x % M) * (x % M)) % M;  // x = (x * x) % M;
	}

	return res;
}

int main() {
	unsigned a, b;
	unsigned long t, divisor = 1000000007;

	cerr << divisor << endl;
	cin >> a >> b >> t;

	// Compute [ (a+b)/2 ]^t * numCells % p
	cout << pow((a + b) / 2, t, divisor) << endl;
}