#include <fstream>
#include <set>
#define NMAX 200005
using namespace std;
int n,a[NMAX],k=1,q,v;
ifstream cin("heapuri.in");
ofstream cout("heapuri.out");
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    set<int> s;
    cin>>n;
    for(int i=1;i<=n;++i)
    {
        cin>>q;
        if(q==3) cout<<*s.begin()<<"\n";
        else
        {
            cin>>v;
            if(q==1)
            {
                a[k]=v;
                s.insert(v);
                k++;
            }
            else s.erase(a[v]);
        }
    }
    return 0;
}