#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
const int BASE = 1e9 + 7;

int a, b;
long long t, result;

void readData() {
    cin >> a >> b >> t;
}

long long power_(int a, long long n) {
    if (n == 0) {
        return 1;
    }
    long long b = power_(a, n / 2);
    b = (b * b) % BASE;
    if (n % 2 == 1) {
        b = (b * a) % BASE;
    }
    return b;
}

void solve() {
    
    // result is (a+b)^t / 2^t
    long long x = power_(a + b, t);
    long long y = power_(2, t);
    result = (x * power_(y, BASE - 2)) % BASE;
    
}

void printResult() {
    cout << result << endl;
}

int main() {
    
    readData();
    solve();
    printResult();
    return 0;
}