SmallShop - nested if

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SmallShop
{
    class Program
    {
        static void Main(string[] args)
        {
            //Напишете програма, която чете град(низ), продукт(низ) и количество(десетично число),
            //въведени от потребителя, и пресмята и отпечатва колко струва съответното количество
            //от избрания продукт в посочения град.

            string product = Console.ReadLine().ToLower();
            string town = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());

            double price = -1.0;

            if (town == "Sofia")
            {
                if (product == "coffee")
                {
                    price = 0.50 * quantity;
                }
                else if (product == "water")
                {
                    price = 0.80 * quantity;
                }
                else if (product == "beer")
                {
                    price = 1.20 * quantity;
                }
                else if (product == "sweets")
                {
                    price = 1.45 * quantity;
                }
                else if (product == "peanuts")
                {
                    price = 1.60 * quantity;
                }
            }
            else if (town == "Plovdiv")
            {
                if (product == "coffee")
                {
                    price = 0.40 * quantity;
                }
                else if (product == "water")
                {
                    price = 0.70 * quantity;
                }
                else if (product == "beer")
                {
                    price = 1.15 * quantity;
                }
                else if (product == "sweets")
                {
                    price = 1.30 * quantity;
                }
                else if (product == "peanuts")
                {
                    price = 1.50 * quantity;
                }
            }
            else if (town == "Varna")
            {
                if (product == "coffee")
                {
                    price = 0.45 * quantity;
                }
                else if (product == "water")
                {
                    price = 0.70 * quantity;
                }
                else if (product == "beer")
                {
                    price = 1.10 * quantity;
                }
                else if (product == "sweets")
                {
                    price = 1.35 * quantity;
                }
                else if (product == "peanuts")
                {
                    price = 1.55 * quantity;
                }
            }
            if (price > 0)
            {
                Console.WriteLine(price);
            }
        }
    }
}