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

long long fastPower(long long x, long long k, long long m) // x ^ k % m
{
    long y = 1;

    while (k != 0)
    {
        if (k % 2 == 0)
        {
            k /= 2;
            x = (x * x) % m;
        }
        else
        {
            k--;
            y = (y * x) % m;
        }
    }
    return y;
}

int main() {
    int a, b;
    long long t;
    
    cin >> a >> b >> t;
    long long ost = 1000000000;

    long long ans = fastPower((a + b) / 2, t, 1000000007);

    cout << ans;

    return 0;
}