#include <iostream>
#include <fstream>
#include <set>
#define p 999983
using namespace std;
ifstream in("hashuri.in");
ofstream out("hashuri.out");
set <int> h[999983];
void adauga(int a)
{
    if(h[a%p].count(a))return;
    h[a%p].insert(a);
}
void sterge(int a)
{
    if(!h[a%p].count(a))return;
    h[a%p].erase(a);
}
int n,cod,x;
int main()
{
    in>>n;
    for(int i=1;i<=n;i++)
    {
        in>>cod>>x;
        switch (cod)
        {
            case 1:
                adauga(x);
            break;
            case 2:
                sterge(x);
            break;
            case 3:
                out<<h[x%p].count(x)<<'\n';
            break;
        }
    }
    return 0;
}