#include <iostream>
#include <cstdio>
#include <map>

using namespace std;

int n, op, nr, poz;
map <int, int> m;

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

    scanf("%d\n", &n);
    for(int i=0;i<n;i++)
    {
        scanf("%d %d\n", &op, &nr);
        if(op==1)
        {
            if(m.find(nr)==m.end())
                m[nr]=poz++;
        }
        else
            if(op==2)
            {
                if(m.find(nr)!=m.end())
                    m.erase(nr);
            }
        else
            {
                if(m.find(nr)!=m.end())
                    printf("1\n");
                else
                    printf("0\n");
            }
    }
    return 0;
}