#include <stdio.h>
#include <map>
 
using namespace std;
 
int N, NR;
map <int, int> M;
 
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;
}