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

const unsigned int x = 1000000007;

unsigned long square(long x) {
    return x * x;
}

unsigned long power(long result, long t) {
    if (t == 0)
        return 1;

    else if (t % 2 == 0)
        return square(power(result, t/2)) % x; // square(x) = x * x

    else
        return ((result % x) * power(result, t-1)) % x;
}

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