Orders - Dictionaries

using System;
using System.Linq;
using System.Collections.Generic;

public class Program
{
	public static void Main()
	{
		var priceProduct = new Dictionary<string, decimal>();
		var quantityProduct = new Dictionary<string, int>();

		while (true)
		{
			string[] tokens = Console.ReadLine().Split();

			string product = tokens[0];

			if (product == "buy")
			{
				break;
			}

			decimal price = decimal.Parse(tokens[1]);
			int quantity = int.Parse(tokens[2]);

			if (priceProduct.ContainsKey(product)==false || quantityProduct.ContainsKey(product)==false)
			{
				priceProduct[product]=price;
				quantityProduct[product]=quantity;
			}
			else
			{
				priceProduct[product]=price;
				quantityProduct[product]+=quantity;
			}
		}

		foreach (var kvp in quantityProduct)
		{
			string product = kvp.Key;
			int quantity = kvp.Value;
			decimal price = priceProduct[product];
			decimal totalPrice = price*quantity;

			Console.WriteLine("{0} -> {1}",product, totalPrice);
		}

	}
}