#include <stdio.h>
#include <map>

using namespace std;

int n,op,x;
map <int,int> hs;

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

    scanf("%d", &n);
    for(int i=1;i<=n;++i)
    {
        scanf("%d %d", &op, &x);
        if(op==1)
            if(hs.find(x)==hs.end())
                hs[x] = 1;
        if(op==2)
            hs.erase(x);
        if(op==3)
            if(hs.find(x) != hs.end())
                printf("1\n");
            else
                printf("0\n");
    }
    return 0;
}