#include <iostream>
using namespace std;

const int mod = 1000000007;

int main() {
	
	long long int a, b, t, sol = 1, pom;
	
	cin >> a >> b >> t;
	
	pom = (a + b ) / 2;
	
	while( t ) {
		
		if( t % 2 ) {
			sol = ( sol * pom ) % mod;
		}
		
		pom = ( pom * pom ) % mod;
		t /= 2;
	}
	
	cout << sol;
	
	return 0;
}