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

long long power(long long x, long long t) {
    if(t == 0)
        return 1;
    else if(t == 1)
        return x;
    else if(t%2 == 0)
        return power((x*x)%1000000007, t/2);
    else
        return x*power((x*x)%1000000007,(t-1)/2)%1000000007;
};

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