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