#include <bits/stdc++.h>

using namespace std;

ifstream f("hashuri.in");
ofstream g("hashuri.out");

int n,i,o,x;
unordered_map <int, bool> mp;

int main()
{
    f>>n;
    for(i=1; i<=n; i++)
    {
        f>>o>>x;
        if(o==1)
            mp[x]=1;
        else if(o==2)
            mp[x]=0;
        else
            g<<mp[x]<<'\n';
    }
    return 0;
}