#include<cstdio>
#include<set>
#include<algorithm>
using namespace std;
int n,i,j,k,x;
set<int>s;
int v[200005];

int main()
{
	freopen("heapuri.in","r",stdin);
	freopen("heapuri.out","w",stdout);
	scanf("%d",&n);
	for (i=1;i<=n;i++)
	{
		scanf("%d",&k);
		if (k!=3) scanf("%d",&x);
		if (k==3) printf("%d\n",*s.begin());else
			if (k==1) s.insert(x),v[++j]=x;else
				if (k==2) s.erase(v[x]);
	}
	return 0;
}