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#include <bits/stdc++.h>
std::ifstream fin("heapuri.in");
std::ofstream fout("heapuri.out");
std::set<int> h;
int poz[200001];
int main()
{
int n, i, op, nr, idx = 1;
fin >> n;
for(i = 0; i < n; i++)
{
fin >> op;
if(op == 1)
{
fin >> nr;
h.insert(nr);
poz[idx++] = nr;
}
if(op == 2)
{
fin >> nr;
h.erase(poz[nr]);
}
else if(op == 3)
fout << *(h.begin()) << '\n';
}
return 0;
}