public static void Main()
string product = Console.ReadLine().ToLower();
string city = Console.ReadLine().ToLower();
double kolichestvo = double.Parse(Console.ReadLine());
Console.WriteLine(kolichestvo * 0.50);
else if(product == "water")
Console.WriteLine(kolichestvo * 0.80);
else if(product == "beer")
Console.WriteLine(kolichestvo * 1.20);
else if(product == "sweets")
Console.WriteLine(kolichestvo * 1.45);
else if(product == "peanuts")
Console.WriteLine(kolichestvo * 1.60);
else if (city == "plovdiv")
Console.WriteLine( kolichestvo * 0.40);
else if(product == "water")
Console.WriteLine( kolichestvo * 0.70);
else if(product == "beer")
Console.WriteLine( kolichestvo * 1.15);
else if(product == "sweets")
Console.WriteLine( kolichestvo * 1.30);
else if(product == "peanuts")
Console.WriteLine( kolichestvo * 1.50);
Console.WriteLine( kolichestvo * 0.45);
else if(product == "water")
Console.WriteLine(kolichestvo * 0.70);
else if(product == "beer")
Console.WriteLine( kolichestvo * 1.10);
else if(product == "sweets")
Console.WriteLine( kolichestvo * 1.35);
else if(product == "peanuts")
Console.WriteLine( kolichestvo * 1.55);