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

const int MOD = 1e9 + 7;

int exp_log(int nr, long long exp) {
    int sol = 1;
    for (int i = 0; (1LL << i) <= exp; i++) {
        if (exp & (1LL << i))
            sol = (1LL * sol * nr) % MOD;
        nr = (1LL * nr * nr) % MOD;
    }
    return sol;
}

int main() {
    int a, b;
    long long t;
    cin >> a >> b >> t;
    cout << exp_log((a + b) / 2, t);
    return 0;
}