#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
typedef unsigned long long ull;


template <typename T>
T modpow(T base, T exp, T modulus) {
  base %= modulus;
  T result = 1;
  while (exp > 0) {
    if (exp & 1) result = (result * base) % modulus;
    base = (base * base) % modulus;
    exp >>= 1;
  }
  return result;
}


/* Function to calculate x raised to the power y in O(logn)*/
uint64_t power(uint64_t x, uint64_t y)
{
    uint64_t temp;
    if( y == 0)
        return 1;
    temp = power(x, y/2) ;
    if (y%2 == 0)
        return temp*temp ;
    else
        return x*temp*temp ;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int a, b;
    cin >> a >> b;
    uint64_t t;
    cin >> t;
    
    //ull result = power(((a+b)/2), t);
    cout << modpow<uint64_t>(((a+b)/2), t, 1000000007) << "\n";
    return 0;
}