#include <bits/stdc++.h>   using namespace std;   int n, l, r, id[1010][1010];   bool tag[1010][1010];   struct node {     int x, y;     pair<vector<node>, int> e() {       vector<node> v;       int c = 0;       v.push_back((node){x + 1, y});       if (x > 0)         v.push_back((node){x - 1, y});       else         c++;       if (x & 1) {         if (x > 0)           v.push_back((node){x - 1, y + 1});         else           c++;       } else {         if (y > 0)           v.push_back((node){x + 1, y - 1});         else           c++;       }       return make_pair(v, c);     }   } a[250010], q[2500010];   vector<node> V;   void dfs(node x, node la) {     if (tag[x.x][x.y]) {       puts( SICK ), exit(0);     }     V.push_back(x), tag[x.x][x.y] = 1;     vector<node> v = x.e().first;     for (int j = 0, sz = v.size(); j < sz; j++)       if (id[v[j].x][v[j].y] && (v[j].x != la.x || v[j].y != la.y)) {         dfs(v[j], x);       }   }   int main() {     ios::sync_with_stdio(0), cin.tie(0);     cin >> n;     for (int i = 1; i <= n; i++) {       cin >> a[i].x >> a[i].y;       tag[a[i].x][a[i].y] = 1;     }     l = 1, r = n;     for (int i = 1; i <= n; i++) q[i] = a[i];     while (l <= r) {       id[q[l].x][q[l].y] = l;       vector<node> u = q[l].e().first, v;       for (int j = 0, sz = u.size(); j < sz; j++) {         if (tag[u[j].x][u[j].y]) continue;         v = u[j].e().first;         for (int k = 0, Sz = v.size(); k < Sz; k++)           if (id[v[k].x][v[k].y] && id[v[k].x][v[k].y] != l) {             q[++r] = u[j], tag[u[j].x][u[j].y] = 1;             break;           }       }       l++;     }     int cnt = 0, ans = 0;     memset(tag, 0, sizeof(tag));     for (int i = 1; i <= r; i++)       if (!tag[q[i].x][q[i].y]) {         V.clear();         cnt++;         dfs(q[i], (node){-1, -1});         if (V.size() == 4) {           int cc = 0;           for (int j = 0; j < 4; j++)             if (id[V[j].x][V[j].y] > n) {               cc++;               vector<node> v = V[j].e().first;               if (v.size() == 3) {                 for (int k = 0; k < 4; k++)                   if (k != j) {                     bool tag = 0;                     for (int l = 0; l < 3; l++)                       if (V[k].x == v[l].x && V[k].y == v[l].y) tag = 1;                     if (tag) cc -= 10;                   }               }             }           if (cc == -29) cnt++;         }       }     for (int i = n + 1; i <= r; i++) id[q[i].x][q[i].y] = 0;     for (int i = 1; i <= n; i++) {       pair<vector<node>, int> v = q[i].e();       ans += v.second;       for (int u, j = 0, sz = v.first.size(); j < sz; j++)         if (!id[v.first[j].x][v.first[j].y]) {           ans++;         }     }     printf( RECOVERED n%d n , ans - 2 * cnt);   }   