#include <iostream>
#include<fstream>
#include<map>
using namespace std;
unorder_map<int,bool>ap;

int main()
{
    long N,i;
    int x,op;
    ifstream f("hashuri.in");
    ofstream g("hashuri.out");
    f>>N;
    for(i=1;i<=N;i++){
        f>>op>>x;
        if(op==1)ap[x]=1;
        else if(op==2)ap[x]=0;
            else if(op==3)g<<ap[x]<<endl;
    }
}