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

long long int power(long long int x, long long int y, long long int p) {
    int res = 1;
 
    x = x % p;
 
    while (y > 0) {
        if (y & 1)
            res = (res * x) % p;
 
        y = y >> 1;
        x = (x * x) % p;  
    }
    return res;
}

int main() {
    long long int x, a, b, t;
    
    cin >> a >> b >> t;
    
    x = (a + b) / 2;
    
    cout << power(x, t, 1000000007) << endl;
    
    return 0;
}