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#include <fstream>
#include <set>
using namespace std;
set <int> a;
long long n,x,k,i,type,v[100005];
int main()
{
ifstream f("heapuri.in");
ofstream g("heapuri.out");
f>>n;
for(i=1; i<=n; i++)
{
f>>type;
if(type==1)
{
f>>x;
a.insert(x);
k++;
v[k]=x;
}
else if(type==2)
{
f>>x;
a.erase(v[x]);
}
else g<<*a.begin() << '\n';
}
f.close(); g.close();
return 0;
}