#include <bits/stdc++.h>
using namespace std;

typedef long long LL;
typedef double dbl;

#define all(x) (x).begin(), (x).end()
#ifdef _DEBUG
# define LOG(x...) fprintf(stderr, x)
#else
# define LOG(x...) 0
#endif

const int INF = 1000000000;
const int MOD = 1000000007;
const dbl EPS = 1e-9;

int binpow(int a, LL p) {
  if (p == 0) return 1;
  if (p == 1) return a;
  if (p & 1) return a * 1ll * binpow(a * 1ll * a % MOD, p / 2) % MOD;
  return binpow(a * 1ll * a % MOD, p / 2);
}

int main() {
#ifdef _DEBUG
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  cin.tie(0);
  cin.sync_with_stdio(0);

  int a, b;
  LL t;
  
  cin >> a >> b >> t;
  
  a += b;
  a /= 2;
  
  cout << binpow(a, t) << endl; 

  return 0;
}