#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <set>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 

    int q = 0, x = 0, y = 0;
    cin >> q ;
    
    set<int> s ;
    set<int> it ;
    for(int i = 0 ; i < q ; i++)
    {
        cin >> x >> y ;
        switch (x)
        {
            case 1 : 
                s.insert(y);
                break;
            case 2 :
                s.erase(y);
                break;
            case 3 :
                if(s.find(y) != s.end()) cout << "Yes\n" ;
                else cout << "No\n" ;
                break;
        }
    }
        
    return 0;
}