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

/* Iterative Function to calculate (x^y) in O(logy) */
long long int power( long long x, long long y, long long p)
{
    long long res = 1;     // Initialize result 
    x = x % p;  // Update x if it is more than or 
                // equal to p
 
    while (y > 0)
    {
        // If y is odd, multiply x with result
        if (y & 1)
            res = (res*x) % p;
        // y must be even now
        y = y>>1; // y = y/2
        x = (x*x) % p;  
    }
    return res;
}


int main() {
     long long  a ,b ;
    long long  total,t;
    cin >> a >> b >> t;
    total = power((.5*(a+b)),t,(pow(10,9)+7));
   // total = power((.5*(a+b)),t) % (unsigned long int)(pow(10,9)+7);
    cout << total;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}