#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
struct TP{
    typedef int tp;
    tree<tp,null_type,less<tp>,rb_tree_tag,tree_order_statistics_node_update> T;
    void add(tp a){T.insert(a);}
    void del(tp a){T.erase(a);}
    int cnt(tp a){return T.order_of_key(a);}
    tp kth(int a){return *T.find_by_order(a);}
    int gt(tp b,tp e){return cnt(e+1)-cnt(b);}
    int sz(){return T.size();}
}T;