#include<fstream>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
const int N = 1000001, M = 666019;
int lst[M];
int val[N];
int urm[N];
int nr=0;
void adauga(int x)
{
    int r=x%M;
    nr++;
    val[nr]=x;
    urm[nr]=lst[r];
    lst[r]=nr;
}
bool cauta(int x)
{
    int p=lst[x%M];
    while(p!=0)
    {
        if(val[p]==x)
            return true;
        p=urm[p];
    }
    return false;
}
void sterge(int x)
{
    int r=x%M,p;
    p=lst[r];
    if(x==val[p])
    {
        lst[r]=urm[p];
        return;
    }
    while(urm[p]!=0)
    {
        if(val[urm[p]]==x)
            urm[p]=urm[urm[p]];
        else
            p=urm[p];
    }
}
int main()
{
    int n,x,o,i;
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>o>>x;
        if(o==1)
            adauga(x);
        if(o==2)
            sterge(x);
        if(o==3)
            g<<cauta(x)<<"\n";
    }
    return 0;
}