#include <bits/stdc++.h>
#define mod 1000003

using namespace std;

ifstream f("hashuri.in");
ofstream g("hashuri.out");

vector <int> hsh[1000010];

void adauga_in_hash(int val)
{
    int rest=val%mod;
    for(int i=0;i<hsh[rest].size();i++)if(hsh[rest][i]==val)return;
    hsh[rest].push_back(val);
}

void sterge(int val)
{
    int rest=val%mod;
    for(int i=0;i<hsh[rest].size();i++) if(hsh[rest][i]==val) {hsh[rest].erase(hsh[rest].begin()+i);return;}
}

int verifica(int val)
{
    int rest=val%mod;
    for(int i=0;i<hsh[rest].size();i++) if(hsh[rest][i]==val)return 1;
    return 0;
}

int n,i,x,op;
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>op>>x;
        if(op==1)adauga_in_hash(x);
        else if(op==2)sterge(x);
        else g<<verifica(x)<<'\n';
    }
    return 0;
}