#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;
template<typename T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;
template<typename T>
using max_heap = priority_queue<T, vector<T>, less<T>>;
using int64 = long long;
using ld = long double;
constexpr int kInf = 1e9 + 10;
constexpr int64 kInf64 = 1e15 + 10;
constexpr int kMod = 1e9 + 7;
int count_mushrooms(int n) {
int ans = 2 - use_machine({0, 1});
for (int i = 2; i < n; i += 2) {
ans += 2 - use_machine({i - 1, 0, i + 1});
}
return ans;
}
