#include <iostream>
#include <fstream>

using namespace std;

ifstream f("hashuri.in"); ofstream g("hashuri.out");
int n,c,nr,p,j,a[1000001],x,i; bool ok;

int cautbin(int x) {
    int st = 1, dr = nr, mij, last = nr;
    while (st <= dr) {
        mij = (st + dr) / 2;
        if (a[mij] == x) {
            ok = 0;
            break;
        }
        if (a[mij] > x) {
            dr = mij - 1;
            last = mij;
        }
        if (a[mij] < x) {
            st = mij + 1;
        }
    }
    return last;
}
int cautbin2(int x) {
    int st = 1, dr = nr, mij;
    ok = 0;
    while (st <= dr) {
        mij = (st + dr) / 2;
        if (a[mij] == x) {
            ok = 1;
            break;
        }
        if (a[mij] > x) {
            dr = mij - 1;
        }
        if (a[mij] < x) {
            st = mij + 1;
        }
    }
    return mij;
}

int main()
{
    f>>n;
    nr = 0;
    for(i = 1; i <= n; ++i) {
        f>>c>>x;
        if ( c == 1) {
            ok = 1;
            p = cautbin(x);
            if (ok) {
                if (p == nr && x > a[nr]) {
                    ++nr;
                    a[nr] = x;
                }
                else {
                    ++nr;
                    for( j = nr; j > p; --j) {
                        a[j] = a[j-1];
                    }
                    a[p] = x;
                }
            }
        }
        if ( c == 2) {
            ok = 1;
            p = cautbin2(x);
            if (ok) {
                for( j = p; j < nr; ++j) {
                    a[j] = a[j+1];
                }
                --nr;
            }
        }
        if ( c == 3) {
            ok = 1;
            p = cautbin2(x);
            if (ok) {
                g<<1<<'\n';
            }
            else g<<0<<'\n';
        }
    }
    return 0;
}