Padawan Equipment

double stockMoney = double.Parse(Console.ReadLine());
int studentsCnt = int.Parse(Console.ReadLine());
double lightsaberPrice = double.Parse(Console.ReadLine());
double robePrice = double.Parse(Console.ReadLine());
double beltPrice = double.Parse(Console.ReadLine());

double percent10lightsabersStudents = Math.Ceiling(studentsCnt * 0.1);
double lightsabers = (studentsCnt + percent10lightsabersStudents) * lightsaberPrice;
double robes = studentsCnt * robePrice;
double sixthBelts = Math.Floor((double)studentsCnt / 6);
double belts = (studentsCnt * beltPrice) - (sixthBelts * beltPrice);

double sum = lightsabers + robes + belts;

if (stockMoney >= sum)
{
    Console.WriteLine($"The money is enough - it would cost {sum:f2}lv.");
}
else
{
    Console.WriteLine($"John will need {sum - stockMoney:f2}lv more.");
}