#include <iostream>
#include <fstream>
#include <vector>
#define NMAX 1000020
#define MOD 9999983
using namespace std;

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

vector<int> p[MOD];
vector<int>::iterator it;

int n, x;

int findX(int x){

int l=x%MOD;
for(auto k : p[l]){
    if(k==x) return 1;
}
return 0;

}

void addX(int x){

if(!findX(x)){

    int l=x%MOD;
    p[l].push_back(x);

}

}

void deleteX(int x){

if(findX(x)){

    int l=x%MOD;
    for(it=p[l].begin(); it<=p[l].end(); it++){
        p[l].erase(it);
        break;
    }

}

}

int main()
{

f>>n;
for(int i=1; i<=n; i++){

    int op, x;
    f>>op>>x;
    if(op==1) addX(x);
    else if(op==2) deleteX(x);
    else g<<findX(x)<<'\n';

}

    return 0;
}