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#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
set<int> s;
set<int> ::iterator ii;
int c,v[200010],x,i,k,n;
int main()
{
f>>n;
for(i=1; i<=n; i++)
{
f>>c;
if(c==1)
{
f>>x;
v[++k]=x;
s.insert(x);
}
else
{
if(c==2)
{
f>>x;
s.erase(s.find(v[x]));
}
else if(c==3)
{
g<<*s.begin()<<'\n';
}
}
}
return 0;
}