#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin >> n;
	auto levi_civita = [](int x, int y, int z) {
		if(x == y or y == z or z == x) return 0;
		if(vector{x, y, z} == vector{0, 1, 2}) return 1;
		if(vector{x, y, z} == vector{1, 2, 0}) return 1;
		if(vector{x, y, z} == vector{2, 0, 1}) return 1;
		return 2;
	};
	vector a(n * 2 + 1, 0), b(0, 0);
	for(auto &v : a) cin >> v;
	for(int i = 0; i < n * 2 - 1; i++) {
		b.push_back(levi_civita(a[i], a[i + 1], a[i + 2]));
	}
	auto mul2 = [](auto &vec) {
		auto ret = vec;
		for(auto &v : vec) ret.push_back(v);
		vec = ret;
	};
	vector one{2, 0, 1, 0}, two{1, 0, 2, 0};
	if(n % 2) swap(one, two);
	while(one.size() < b.size()) mul2(one);
	one.resize(b.size());
	while(two.size() < b.size()) mul2(two);
	two.resize(b.size());
	cout << (b == one ? 1 : b == two ? 2 : 0) << endl;
}