#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    long long t, a, b;
    cin >> a >> b >> t;
    long long p = (a + b) / 2;
    long long mod = 1000*1000*1000 + 7;
    long long retval = 1;
    long long power = p;
    while (t > 0) {
        if ((t % 2) == 1) 
            retval = (retval * power) % mod;
        power = (power * power) % mod;
        t /= 2;
    }
    std::cout << retval;
    return 0;
}