func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long mod = 1e9 + 7;   bool sortinrev(const pair<int, int> &a, const pair<int, int> &b) {     return (a.first > b.first);   }   bool sortbysec(const pair<int, int> &a, const pair<int, int> &b) {     return (a.second < b.second);   }   long long int power(long long int x, long long int y, long long int p) {     long long int res = 1;     x = x % p;     while (y > 0) {       if (y & 1) res = (res * x) % p;       y = y >> 1;       x = (x * x) % p;     }     return res;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     double x1, x2, y1, y2, r;     cin >> r >> x1 >> y1 >> x2 >> y2;     double d = sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));     double a = d / (2 * r);     int b;     if ((int)a * 2 * r == d)       b = 0;     else       b = 1;     if (b == 0)       cout << (int)a;     else       cout << (int)a + 1;     return 0;   }   