#include <bits/stdc++.h>
using namespace std;
int n,op,x;
unordered_map<int, bool> mp;

ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

int main()
{
    fin >> n;
    while(n--){
        fin >> op >> x;
        if(op == 1){
            mp[x] = 1;
        }else if(op == 2){
            mp[x] = 0;
        }else{
            fout << ( mp.count(x) ? mp[x] : 0) << "\n";
        }
    }
    return 0;
}