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#include <bits/stdc++.h>
using namespace std;
map <int, int> f[666013];
void insert (int x){
f[x%666013][x]+=1;
}
void erase (int x){
f[x%666013].erase(x);
}
bool find (int x){
return f[x%666013].count(x)!=0;
}
int main()
{
ifstream fin ("hashuri.in");
ofstream fout ("hashuri.out");
int n;
fin>>n;
for (int i=1;i<=n;i++) {
int op,x;
fin >>op>>x;
if (op == 1) insert(x);
if (op == 2) erase(x);
if (op == 3) fout<<find(x)<<'\n';
}
return 0;
}