#define _USE_MATH_DEFINES

#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max,count
#include <string>	//string,getline, to_string
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap, pair
#include <cstdlib>	//abs(int)
#include <cmath>	//sqrt,ceil,M_PI, pow, sin
#include <sstream>	//stringstream, getline
#include <numeric>	//gcd, accumlate
#include <deque>	//deque
#include <random>	//randam_device
#include <limits>	//numeric_limits

using namespace std;
constexpr long long int D_MOD = 1000000007;

int main() {

	long long int F0, F1, F2, N;
	cin >> F0 >> F1 >> N;

	F2 = F0 ^ F1;

	switch (N % 3) {
	case 0: cout << F0 << endl; break;
	case 1: cout << F1 << endl; break;
	case 2: cout << F2 << endl; break;
	}

	return 0;

}