#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

int main()
{
    int n, i;
    long fr[100005], a[100005],b[100005];

    fin >> n;
    for(i = 1 ; i <= n ; ++ i)
    {
        fin >> a[i] >> b[i];
    if(a[i] == 1)
    {
        if(fr[a[i]] == 0)
        fr[a[i]]++;
    }

    if(a[i] == 2)
    {
        if(fr[a[i]] == 1)
        fr[a[i]]--;
    }

    if(a[i] == 3)
    {
        if(fr[a[i]] == 0)   fout<<"0"<<'\n';
        else
        fout<<"1"<<'\n';
    }
    }

    return 0;
}