#include <stdio.h>
#include <map>
#include <ext/hash_map>

using namespace std;
using namespace __gnu_cxx ;

/*namespace __gnu_cxx {
    template<> struct hash<int>
    { size_t operator()(int __x) const { return __x * r1; } };
}*/
int N, NR;
hash_map <int, int> M;
const int r1 = 666013;



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

    int i, tip, x;

    scanf("%d ", &N);

    for (i = 1; i <= N; i++)
    {
        scanf("%d %d ", &tip, &x);

        if (tip == 1 && M.find(x)==M.end()) M[x] = ++NR;
        if (tip == 2) M.erase(x);
        if (tip == 3) printf("%d\n", M.find(x) != M.end());
    }

    return 0;
}