#include <iostream>
#include <cstdio>
#include <vector>
#define B 666013
using namespace std;
int op,N,val;
vector <int> H[B];
int fi(int val)
{
    int lim=H[val%B].size();
    for(int i=0;i<lim;i++)
        if(val==H[val%B][i])
            return i;
    return -1;
}
void in(int val)
{
    if(fi(val)>=0)
        return ;
    H[val%B].push_back(val);
}
void out(int val)
{
    int st=fi(val);
    if(st<0)
        return ;
    int lim=H[val%B].size();
    for(int i=st;i<lim-1;i++)
        H[val%B][i]=H[val%B][i+1];
    H[val%B].pop_back();
}
int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    cin>>N;
    for(int i=1;i<=N;i++)
    {
        cin>>op>>val;
        if(op==1)
            in(val);
        else if(op==2)
            out(val);
        else
        {
            cout<<(fi(val)>=0)<<"\n";
        }
    }
    return 0;
}