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


int main() {
    unsigned a, b;
    unsigned long long t;
    std::cin >> a >> b >> t;
    
    if (t == 0) { std::cout << 1 << std::endl; return 0; }
    
    unsigned long long step = (a + b) / 2;
    unsigned long long result = 1;
    
    while (t) {
        if (t & 1) {
            result *= step;
            result %= 1000000007;
        }
        
        step *= step;
        step %= 1000000007;
        t >>= 1;
    }
    
    std::cout << result << std::endl;
    return 0;
}