func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int R = 0;     int d = 0;     int n = 0;     cin >> R;     cin >> d;     cin >> n;     int x;     int y;     int r;     int counter = 0;     double low = 0;     double high = 0;     for (int i = 0; i < n; i++) {       cin >> x;       cin >> y;       cin >> r;       if (((sqrt(x * x + y * y) - r) >= (R - d)) &&           ((sqrt(x * x + y * y) + r) <= R))         counter++;     }     cout << counter;     return 0;   }   