#include <bits/stdc++.h>

#define show(x) cout << #x << " = " << x << endl

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v)
{
    os << "sz=" << v.size() << "\n[";
    for (const auto& p : v) {
        os << p << ",";
    }
    os << "]\n";
    return os;
}

template <typename S, typename T>
ostream& operator<<(ostream& os, const pair<S, T>& p)
{
    os << "(" << p.first << "," << p.second
       << ")";
    return os;
}


constexpr ll MOD = 1e9 + 7;

template <typename T>
constexpr T INF = numeric_limits<T>::max() / 100;

int main()
{
    ll f0, f1, n;
    cin >> f0 >> f1 >> n;
    const ll f2 = f0 xor f1;
    switch (n % 3) {
    case 0: {
        cout << f0 << endl;
        break;
    }
    case 1: {
        cout << f1 << endl;
        break;
    }
    case 2: {
        cout << f2 << endl;
        break;
    }
    }
    return 0;
}