#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
#include <ctype.h>
#include <string>
#include <stack>
using namespace std;
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)
struct omt{omt(){ios::sync_with_stdio(false);cin.tie(0);}}star;

int main(){
    long long a, b, n;
    cin >> a >> b >> n;
    if(n % 3 == 0) cout << a << endl;
    else if(n % 3 == 1) cout << b << endl;
    else if(n % 3 == 2) cout << (a ^ b) << endl;

    return 0;
}