func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     double r, x1, y1, x2, y2;     cin >> r >> x1 >> y1 >> x2 >> y2;     long long x =         (long long)sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)) / 2 / r;     if (x * 2.0 * r < sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)))       cout << x + 1;     else       cout << x;     return 0;   }   