func_code_string: #include <bits/stdc++.h>   using namespace std;   struct point {     long long x, y;   };   istream &operator>>(istream &in, point &p) {     in >> p.x >> p.y;     return in;   }   ostream &operator<<(ostream &out, point &p) {     out << p.x <<     << p.y;     return out;   }   double len(struct point a, struct point b) {     return sqrt((a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y));   }   int main() {     ios_base::sync_with_stdio(NULL);     cin.tie(NULL);     cout.tie(NULL);     long long r;     point a, b;     cin >> r;     cin >> a >> b;     cout << ceil(len(a, b) / (r * 2));     return 0;   }   