#include <bits/stdc++.h>

using namespace std;

ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

int main()
{
    int q;
    fin>>q;
    map <int,int> fq;
    while(q--)
    {
        int op,x;
        fin>>op>>x;
        if(op==1)
            fq[x]=1;
        else if(op==2)
            fq[x]=0;
        else
            fout<<fq[x]<<"\n";
    }

    fin.close();
    fout.close();

    return 0;
}