#include <map>
#include <set>
#include <array>
#include <cmath>
#include <deque>
#include <limits>
#include <vector>
#include <string>
#include <cassert>
#include <iomanip>
#include <iostream>
#include <cinttypes>
#include <algorithm>
#include <unordered_map>

using namespace std;


void runOne()
{
  constexpr uint64_t M = 1e9 + 7;

  uint64_t a, b;
  cin >> a >> b;
  uint64_t t;
  cin >> t;

  uint64_t c = (a + b) >> 1;
  uint64_t res = 1;
  uint64_t acc = c;
  for (uint64_t i = 0; i < 64; ++i)
  {
    if (t & (1ull << i))
    {
      res *= acc;
      res %= M;
    }
    acc = acc * acc;
    acc %= M;
  }

  cout << res << endl;
}


int main(int, char**)
{
  ios_base::sync_with_stdio(false);
  cin.tie(NULL); cout.tie(NULL); cerr.tie(NULL);

  size_t t = 1;
  //cin >> t;
  while (t--)
    runOne();

  return 0;
}