#include <fstream>
#include <unordered_map>

using namespace std;

const int nmax=1000000;

ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

unordered_map <int, int> um;

int main(){
    int n;
    fin>>n;
    for(int i=1;i<=n;i++){
        int x,y;
        fin>>x>>y;
        if(x==1){
            um[y]++;
        }else if(x==2){
            if(um[y]>0){
                um[y]--;
            }
        }else{
            if(um[y]>0){
                fout<<"1\n";
            }else{
                fout<<"0\n";
            }
        }
    }
    return 0;
}