#include<iostream>
#include<fstream>
using namespace std;
ofstream g("hashuri.out");
int sir[10000001];
void hashing (int op,int x)
{
    if(op==1)
        sir[x]++;
    if(op==2)
        sir[x]--;
    if(op==3)
        if(sir[x]>0)
            g << "1" << "\n";
        else if(sir[x]==0)
            g << "0" << "\n";
}
void read()
{
    int x,n,op;
    ifstream f("hashuri.in");

    f >> n;
    for(int i=1;i<=n;i++)
    {
        f >> op >> x;
        hashing(op,x);
    }
    f.close();
    g.close();
}
int main()
{
    read();
    return 0;
}