#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>
#include <bitset>
#include <utility>

#define rep(i,a,b) for(int i=int(a); i<=int(b); ++i)
#define rev(i,b,a) for(int i=int(b); i>=int(a); --i)
#define rec(i,a,b,c) for(int i=int(a); i<=int(b); i+=int(c))
#define recv(i,a,b,c) for(int i=int(a); i>=int(b); i-=int(c))
#define mp(x,y) make_pair((x),(y))
#define pb(x) push_back(x)
#define all(c) c.begin(), c.end()
#define tr(container, it) for(auto it=(container).begin(); it != (container).end(); ++it)
#define sqr(x) ((x)*(x))
#define sz(a) int((a).size())
#define mod(a,n) ((a) < 0 ? ((n)+(a)) : ((a)%(n)))
#define mout(M,n,m) rep(i,0,(n)-1){ rep(j,0,(m)-1) cout << (M)[i][j] << " ";  cout << "\n"; }
#define vout(A,l,r) rep(i,l,r) cout << A[i] << " ";
using namespace std;

#define INF_ULL ULLONG_MAX
#define INF_LL  LLONG_MAX
#define NINF_LL LLONG_MIN
#define INF_L   LONG_MAX
#define NINF_L   LONG_MIN
#define INF_U   UINT_MAX
#define INF     INT_MAX
#define NINF     INT_MIN

typedef vector<int> vi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef unsigned long long ull;

int main(){

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

  int n;
  scanf("%d", &n);
  map<ull, bool> M;
  rep(i,0,n-1){
    int op;
    ull x;
    scanf("%d %lld\n", &op, &x);
    if(op == 1)
      M.insert(make_pair(x,true));
    else if(op == 2)
      M.erase(x);
    else{
      if(M.find(x) != M.end())
        printf("1\n");
      else
        printf("0\n");
    }
  }

  return 0;
}