#include <fstream>
#include <vector>

#define H 1003

using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
vector<int> h[H];
int n,x,val,cod;
int main()
{
    fin>>n;
    for(;n;n--)
    {
        fin>>cod>>val;
        x=val%H;
        vector<int>::iterator it;
        for(it=h[x].begin();it!=h[x].end();it++)
            if(*it==val)
                break;
        if(cod==1)
        {
            if(it==h[x].end())
                h[x].push_back(val);
        }
        else if(cod==2)
        {
            if(it!=h[x].end())
            {
                *it=h[x].back();
                h[x].pop_back();
            }
        }
        else
        {
            if(it==h[x].end())
                fout<<"0\n";
            else
                fout<<"1\n";
        }
    }
    return 0;
}