#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    int a;
    int b;
    unsigned long long t;
    cin >> a;
    cin >> b;
    cin >> t;
    int p = 1000000007;
   
    unsigned long long c = 1;
    unsigned long long base = 0.5*a+0.5*b;
    base = base % p;
    while (t > 0) {
        if (t & 1){
            c = (c*base) % p;
        }
        //cout << "c: " << c << endl;
        
        t = t>>1;
        //cout << "t: " << t << endl;
        base = (base*base) % p;
        //cout << "base: " << base << endl;
    }
    cout << c;
    return 0;
}