#include <fstream>
#include <unordered_map>
#define nmax (int)(5e4+1)
using namespace std;
ifstream cin("hashuri.in");
ofstream cout("hashuri.out");
int n,x,task;
unordered_map<int,bool>mp;
signed main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>task>>x;
        if(task==1)
            mp[x]=1;
        else if(task==2)
            mp[x]=0;
        else
            cout<<mp[x]<<'\n';
    }
    return 0;
}