class CAritmetica
{
  /*
   * Operaciones aritméticas 
   */
  public static void main (String[] args)
  {
    double a = 10;
    float b = 20;
    int c = 2, r = 0;
    r = (int)(7.5 * Math.sqrt(a) - b / c);
    System.out.println(r);
  }
}