#include <fstream>
#include <vector>
#define prim 49157
using namespace std;
int i,n,operatie,x;
vector<int>v[49157];
void adauga(int x)
{
    int k=x%prim;
    for(unsigned int i=0;i<v[k].size();i++)
      if(v[k][i]==x)
        return;
    v[k].push_back(x);
}
void sterge(int x)
{
    int k=x%prim;
    int idx=-1;
    for(unsigned int i=0;i<v[k].size();i++)
        if(v[k][i]==x)
        {
          idx=i;
          break;
        }
    if (idx!=-1)
        v[k].erase(v[k].begin()+idx);
}
int verifica(int x)
{
    int k=x%prim;
    for(unsigned int i=0;i<v[k].size();i++)
        if(v[k][i]==x)
            return 1;
    return 0;
}
int main()
{
    ifstream f("hashuri.in");
    ofstream g("hashuri.out");
    f>>n;
    for (i=0;i<n;i++)
    {
        f>>operatie>>x;
        if (operatie==1)
            adauga(x);
        else if (operatie==2)
              sterge(x);
            else g<<verifica(x)<<endl;
    }
    f.close();
    g.close();
    return 0;
}