#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    freopen("heapuri.in","r",stdin);
    freopen("heapuri.out","w",stdout);
    int q;
    set<int>s;
    vector<int>v;
    cin>>q;
    while(q--) {
        int tip;
        cin>>tip;
        if(tip==1) {
            int foo;
            cin>>foo;
            s.insert(foo);
            v.push_back(foo);
        }
        if(tip==2) {
            int foo;
            cin>>foo;
            s.erase(v[foo-1]);
        }
        if(tip==3) {
            cout<<*s.begin()<<"\n";
        }
    }
    return 0;
}