#include <cstdio>
#include <set>
using namespace std;
set <int> b;
int comanda,n,x;
int poz[200010],nr;
int main()
{
    freopen("heapuri.in","r",stdin);
    freopen("heapuri.out","w",stdout);
    scanf("%d",&n);
    for(int i=0;i<n;i++)
    {
        scanf("%d",&comanda);
        if(comanda==3)
        {
            printf("%d\n",*b.begin());
        }
        else
        {
            scanf("%d",&x);
            if(comanda==1)
            {
                b.insert(x);
                poz[++nr]=x;
            }
            else
            {
                b.erase(*b.find(poz[x]));
            }
        }
    }
    return 0;
}