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#include <iostream>
#include <fstream>
#include <string.h>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int main(){
int i,x,c,n=0;
set <int> v;
int o[10000];
f>>x;
for(i=1;i<=x;i++){
f>>c;
if(c==3) g<<*v.begin()<<endl;
else if(c==1) {
f>>c;
n++;
o[n]=c;
v.insert(c);
}
else{
f>>c;
v.erase(o[c]);
}
}
return 0;
}