#define I inline #define fi first #define se second #define pb push_back #define MP make_pair #define PII pair<int , int> #define PSL pair<string , long long> #define PLL pair<long long , long long> #define all(x) (x).begin() , (x).end() #define copy(a , b) memcpy(a , b , sizeof(b)) #define clean(a , b) memset(a , b , sizeof(a)) #define rep(i , l , r) for (int i = (l); i <= (r); i ++) #define per(i , r , l) for (int i = (r); i >= (l); i --) #define PE(i , x) for(int i = head[x]; i; i = edge[i].last) #define DEBUG(x) std :: cerr << #x << '=' << x << std :: endl
typedeflonglong ll; typedefunsignedlonglong ull;
template <classT> inlinevoidread(T &x){ char c = getchar(), f = 0; x = 0; while (!isdigit(c)) f = (c == '-'), c = getchar(); while (isdigit(c)) x = x * 10 + c - '0', c = getchar(); x = f ? -x : x; }
usingnamespacestd;
constint N = 10001; constint M = 100001; constint HA = 998244353;
ll n; set<PLL> big , small; ll smb , sma , smk , k;