#include<vector>
#include<set>
#include<fstream>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int i,n,op,x;
set<int>s;
set<int>::iterator it;
vector<int>v;
int main()
{
    f>>n;
    for(i=1;i<=n;++i)
    {
        f>>op;
        if(op==1)
        {
            f>>x;
            v.push_back(x);
            s.insert(x);
        }
        else
        if(op==2)
        {
            f>>x;
            s.erase(v[x-1]);
        }
        else
        {
            g<<*(it=s.begin())<<'\n';
        }
    }
    return 0;
}