#include <iostream>
#include <bits/stdc++.h>
using namespace std;
ifstream fin ("hashuri.in");
ofstream fout ("hashuri.out");
int N,tip,x;
map <int,bool>M;
int main()
{
    fin>>N;
    while(N--)
    {
        fin>>tip>>x;
        if(tip==1)
            M[x]=1;
        if(tip==2)
            M[x]=0;
        if(tip==3)
            fout<<M[x]<<'\n';
    }
    return 0;
}