#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<utility>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<functional>
#include<math.h>
#include<random>
#include <bitset>
using namespace std;
#define N (1000000000+7)
//#define N 998244353
#define INF 1e16
typedef long long ll;
typedef pair<int,int> P;
typedef pair<int,P> Q;

const int inf = (int)1e9; 

ll gcd(ll a, ll b) {
	if (b > a) {
		ll tmp = b;
		b = a;
		a = tmp;
	}
	if (a%b == 0)return b;
	else return gcd(b, a%b);
}

int main(void){
	ll f0,f1,n;
	cin>>f0>>f1>>n;
	if(n%3==0)cout<<f0<<endl;
	else{
		if(n%3==1)cout<<f1<<endl;
		else{
			cout<<(f0^f1)<<endl;
		}
	}
	return 0;
}