#include <stdio.h>
#include <fstream>
using namespace std;
//ifstream fin("hasuri.in");
//ofstream fout ("hasuri.out");

int N, multime[100], l=0;

int gaseste(int x){
    for(int i=0; i<l; i++)
        if (multime[i]==x)
            return i;
    return 0;
}

void inserare(int x){
    if(gaseste(x) == 0)
        multime[l+1] = x;
}

inline void stergere(int x)
{
    if (gaseste(x)!=0)
        for (int i = gaseste(x); i<l; i++)
            multime[i] = multime[i+1];
    l = l-1;
}

int main() {
    int op, x;

    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);

    for (scanf("%d", &N); N > 1; N--) {
        scanf("%d %d", &op, &x);
        if (op == 1)
            inserare(x);

        if (op == 2)
            stergere(x);

        if (op == 3)
            printf("%d\n", gaseste(x) != 0);

    }

    return 0;
}