#include <iostream>
#include <cstdio>
#include <vector>
#define MOD=666013
using namespace std;
vector< int> v;
int N,i,f,x,p,j;
int cauta()
{
    for(j=0;j<v.size();j++)
    {
        if(v[j]==x)
            return 1;
    }
    return 0;
}
void sterge()
{
    for(j=0;j<v.size();j++)
    {
        if(v[j]==x)
            v.erase(v.begin()+j),j=v.size();
    }
}
int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    cin>>N;
    for(i=1;i<=N;i++)
    {
        cin>>f>>x;
        if(f==1)
        {
            if(cauta()==0)
                v.push_back(x);
        }
        else
        {
            if(f==2)
            {
                sterge();
            }
            else
            {
                cout<<cauta()<<"\n";
            }
        }
    }
    return 0;
}