func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     double r, x, y, x1, y1;     cin >> r >> x >> y >> x1 >> y1;     double dist = sqrt(pow(x - x1, 2) + pow(y - y1, 2));     double ans = dist / (2 * r);     cout << ceil(ans) << endl;   }   