#include <bits/stdc++.h>
#include "mushrooms.h"
using namespace std;
typedef long long ll;
const int LIM = 100;
int countIfNIsSmall(int n){
int ans = 1;
for(int i=1; i<=n; i+=2){
if(i==n) ans += 1 - use_machine(vector<int> {i, 0});
else ans += 2 - use_machine(vector<int> {i, 0, i+1});
}
return ans;
}
int n;
int arr[20002];
int pointer = 1;
vector<int> vec[2];
int ans;
int count_mushrooms(int n){
if(n<=400) return countIfNIsSmall(n);
arr[0] = 0;
while(vec[0].size() < 2 && vec[1].size() < 2){
if(use_machine(vector<int> {0, pointer}) == 1){
arr[pointer] = 1;
vec[1].push_back(pointer);
}
else{
arr[pointer] = 0;
vec[0].push_back(pointer);
}
pointer++;
}
while(vec[0].size() < LIM && vec[1].size() < LIM){
int mode = (vec[0].size() >= 2 ? 0 : 1);
int tmp = use_machine(vector<int> {vec[mode][0], pointer, vec[mode][1], pointer+1});
arr[pointer] = mode ^ (tmp >= 2);
vec[arr[pointer]].push_back(pointer);
arr[pointer+1] = mode ^ (tmp % 2);
vec[arr[pointer+1]].push_back(pointer+1);
pointer += 2;
}
while(pointer < n){
int mode = (vec[0].size() >= vec[1].size() ? 0 : 1);
vector<int> queryVec (1, pointer++);
queryVec.push_back(vec[mode][0]);
for(int i=1; i<(int)vec[mode].size() && pointer<n; i++){
queryVec.push_back(pointer++);
queryVec.push_back(vec[mode][i]);
}
int ret = use_machine(queryVec);
int spnt = queryVec[0];
arr[spnt] = mode ^ (ret % 2);
vec[arr[spnt]].push_back(spnt);
ret /= 2;
for(int j=spnt+1; j<pointer; j++){
if(j <= spnt+ret) arr[j] = !mode;
else arr[j] = mode;
}
}
for(int i=0; i<n; i++){
if(arr[i] == 0) ans++;
}
return ans;
}
