static void Main(string[] args)
string product = Console.ReadLine();
string town = Console.ReadLine();
double quantity = double.Parse(Console.ReadLine());
result = quantity * 0.50;
else if (product == "water")
result = quantity * 0.80;
else if (product == "beer")
result = quantity * 1.20;
else if (product == "sweets")
result = quantity * 1.45;
result = quantity * 1.60;
else if (town == "Plovdiv")
result = quantity * 0.40;
else if (product == "water")
result = quantity * 0.70;
else if (product == "beer")
result = quantity * 1.15;
else if (product == "sweets")
result = quantity * 1.30;
result = quantity * 1.50;
result = quantity * 0.45;
else if (product == "water")
result = quantity * 0.70;
else if (product == "beer")
result = quantity * 1.10;
else if (product == "sweets")
result = quantity * 1.35;
result = quantity * 1.55;
Console.WriteLine(result);