public static void Main()
int days = int.Parse(Console.ReadLine());
int people = int.Parse(Console.ReadLine());
int cakes = int.Parse(Console.ReadLine());
int waffles = int.Parse(Console.ReadLine());
int pancakes = int.Parse(Console.ReadLine());
double sum = ((cakes * 45) + (waffles * 5.80) + (pancakes * 3.20)) * days * people * 7 / 8;
Console.WriteLine("{0:F2} лева", sum);