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

int n, nr, op, x;
unordered_map<int,int>M;

int main()
{
    ifstream fin("hashuri.in");
    ofstream fout("hashuri.out");
    fin>>n;
    while(n--)
    {
        fin>>op>>x;
        if(op==1 && M.find(x)==M.end())
            M[x]=++nr;
        if(op==2)
            M.erase(x);
        if(op==3)
            fout<<(M.find(x)!=M.end())<<'\n';
    }
    return 0;
}