#include <bits/stdc++.h>
#include <sys/mman.h>
#include <ext/pb_ds/assoc_container.hpp>
  
using namespace std;
  
typedef __gnu_pbds::gp_hash_table<int, __gnu_pbds::null_type> UnorderedSet;
 
struct _io{
    char*s;
    _io():s((char*)mmap(0,1<<28,PROT_READ,MAP_PRIVATE,fileno(stdin),0)){}
    operator int(){
        int x=0;
        while(*s<48)s++;
        while(*s>32)x=x*10+*s++-48;
        return x;
    }
};
 
int main() {
#ifdef INFOARENA
    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);
#endif
    UnorderedSet s;
    _io it;
    int num_queries = it;
      
    while (num_queries--) {
        int query_type = it, el = it;
        if (query_type == 1) {
            s.insert(el);
        } else if (query_type == 2) {
            s.erase(el);
        } else {
            putchar((s.find(el) != s.end()) + '0');
            putchar('\n');
        }
    }
  
    return 0;