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#include <fstream>
#include <algorithm>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int n,x[200001],k,a,b;
set<int> h;
int main()
{
f>>n;
for(int i=1;i<=n;i++){
f>>a;
if(a==3)
g<<*h.begin()<<"\n";
if(a==1){
f>>x[++k];
h.insert(x[k]);}
else
if(a==2){
f>>b;
h.erase(x[b]);}
}
return 0;
}