#include <iostream>
#include <fstream>
#include <map>
using namespace std;
map <int,int> seen;
int main()
{
    ifstream fin ("hashuri.in");
    ofstream fout ("hashuri.out");
    int i,n,q,x;
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>q>>x;
        if(q==1)
            seen[x]=1;
        if(q==2)
            seen[x]=0;
        if(q==3)
            fout<<seen[x]<<"\n";
    }
    return 0;
}