#include <fstream>
#include <vector>

#define MOD 666013
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
vector <int> H[MOD];
int H_find(int x)
{
    int cod = x%MOD;
    for(size_t i=0;i<H[cod].size();i++)
        if(H[cod][i] == x)
            return 1;
    return 0;
}
void H_insert(int x)
{
    int cod = x%MOD;
    H[cod].push_back(x);
}
void H_erase(int x)
{
    int cod = x%MOD;
    for(size_t i=0;i<H[cod].size();i++)
        if(H[cod][i]==x)
            H[cod].erase(H[cod].begin()+i);
}
int main()
{
    int n,i,op,x;
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>op>>x;
        switch (op)
        {
        case 1:
            {
                if(H_find(x)==0)
                    H_insert(x);
                break;
            }
        case 2:
            {
                if(H_find(x))
                    H_erase(x);
                break;
            }
        case 3:
            {
                fout<<H_find(x)<<'\n';
            }
        }
    }
    return 0;
}