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#include <iostream>
#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int main() {
int n,i,nr,x;
f>>n;
int v[n+1],l=0;
set<int> m;
for(i=1;i<=n;i++)
{
f>>nr;
if(nr==1)
{
f>>x;
v[l]=x;
l++;
m.insert(x);
}
if(nr==2)
{
f>>x;
m.erase(v[x-1]);
}
if(nr==3)
{
g<<*m.begin()<<endl;
}
}
}