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

unsigned long long int power(unsigned long long int x, unsigned long long int y)
{
    unsigned long long int  m = 1000000007;
    int res = 1;     // Initialize result
    x = x % m;
    while (y > 0)
    {
        if (y % 2 == 1){
            res = (res*x)%m;
        }
        y = y>>1;
        x = (x*x)%m;
    }
    return res;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    unsigned long long int a,b,t, temp;
    cin >> a ;
    cin >> b ;
    cin >> t ;
    temp = (a + b)/2;
    cout << power(temp,t);
    return 0;
}