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#include <bits/stdc++.h>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
set<int>h;
int poz[200001],p,i,m,n,x;
int main()
{
f>>n;
for(i=1;i<=n;i++)
{
f>>p;
if(p==1)
{
f>>x;
h.insert(x);
poz[++m]=x;
}
if(p==2)
{
f>>x;
h.erase(poz[x]);
}
if(p==3)
{
g<<*h.begin()<<'\n';
}
}
return 0;
}