#include<fstream>
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
unsigned n,a[10000001],i,x,y,nr=1,p=0,k,j;
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>x>>y;
        if(x==1)
        {
            p=1;
            for(j=1;j<=nr;j++)
            {
                if(a[j]==y)
                {
                    p=0;
                    break;
                }
            }
            if(p==1)
            {
                nr++;
                a[nr]=y;
            }
        }
        if(x==2)
        {
            for(j=1;j<=nr;j++)
            {
                if(a[j]==y)
                {
                    nr--;
                    for(k=j;k<=nr;k++)
                    {
                        a[j]=a[j+1];
                    }
                    break;
                }
            }
        }
        if(x==3)
        {
            p=0;
            for(j=1;j<=nr;j++)
            {
                if(a[j]==y)
                {
                    p=1;
                    break;
                }

            }
            if(p==1)
                fout<<1<<"\n";
            else
                fout<<0<<"\n";
        }
    }
    return 0;
}