#include <bits/stdc++.h>

using namespace std;


map <int,int> m;
int main()
{
    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);
    int n,x,y;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>x>>y;
        switch(x){
        case 1:
            m[y]=1;
            break;
        case 2:
            m[y]=0;
            break;
        case 3:
            if(m[y]==1)
                cout<<1<<"\n";
            else
                cout<<0<<"\n";
            break;
        }
    }
    return 0;
}