#include <iostream>
#include <cstdio>
#define h 1000000
using namespace std;
#include <vector>
int n,j,cp,a,op,x;
vector <int> M[1000000];
void in(int x)
{
    int c=x%h;
    M[c].push_back(x);
}
int ver(int x)
{
    int c=x%h;
    int i;
    int l=M[c].size();
    for (i=0;i<l;i++)
    {
        if (M[c][i]==x) return 1;
    }
    return 0;
}
void elim(int x)
{
    int c=x%h;
    int l=M[c].size();
    int i;
    for (i=0;i<l;i++)
    {
        if (M[c][i]==x)
        {
            M[c].erase(M[c].begin()+i);
            return;
        }
    }
}
int main()
{

    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    scanf("%lli",&n);
    for (j=0;j<n;j++)
    {
        scanf("%lli %lli",&op,&x);
        if (op==1) in(x);
        else if (op==2) elim(x);
        else cout<<ver(x)<<'\n';
    }
}