#include<fstream>
#include<map>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
int t,x,n,i;
map<int, int>m;
int main()
{
    f>>n;
    for(i=1;i<=n;++i)
    {
        f>>t>>x;
        if(t==1)
        m[x]=1;
        if(t==2)
        m.erase(x);
        if(t==3)
        g<<(m.find(x)!=m.end())<<'\n';
    }
    return 0;
}