static void Main(string[] args)
{
string[] cases = Console.ReadLine().Split(' ');
double cash = double.Parse(cases[0]) + 0.5;
if (int.Parse(cases[0]) % 5 == 0)
{
double temp = double.Parse(cases[1]);
if (cash > (double.Parse(cases[1]) / 100))
Console.WriteLine(cases[1]);
else
Console.WriteLine((double.Parse(cases[1]) / 100) - cash);
}
else
Console.WriteLine(cases[1]);
Console.ReadLine();
}