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

int power(int x, unsigned int y, 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() {
    int a, b, t;
    cin >> a >> b >> t;
    
    cout << power(0.5*(a+b), t, 1000000007);
    return 0;
}