#include <fstream>
#include <map>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
#define mod 666003
map <int, int> H;
map <int, int> :: iterator it;
int main()
{
    int n, i, v, x;
    f >> n;
    for(i = 1; i <= n; i++){
        f >> v;
        switch(v){
        case 1:
            f >> x;
            H[x] = 1;
            break;
        case 2:
            f >> x;
            it = H.find(x);
            if(it != H.end())
                H.erase(it);
            break;
        case 3:
            f >> x;
            it = H.find(x);
            if(it != H.end())
                g << 1;
            else
                g << 0;
            g << '\n';
            break;
        }
    }
    return 0;
}