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

map <int, int> Multime;

int main(){
    int n, numar = 0, i, tipOp, x;

    ifstream f("hashuri.in");
    ofstream g("hashuri.out");

    f>>n;
    for(i = 1; i <= n; i++){
        f>>tipOp;
        f>>x;
        if(tipOp == 1 && Multime.find(x) == Multime.end())
            Multime[x] = numar++;
        if(tipOp == 2)
            Multime.erase(x);
        if(tipOp == 3)
            g<< Multime.find(x) != Multime.end();
    }

    f.close();
    g.close();
    return 0;
}