using System;

public class Program

{

    public static void Main()

    {

        string marketID = "538SOMETHING";

        int contracts = 1;

        int priceContract = 90;

        Console.WriteLine($"Ticker: {marketID}. Contracts: {contracts}, price/Contract: {priceContract}. Commishky: {CalculateCommission(marketID, contracts, priceContract)}");

    }

        static int CalculateCommission(string marketID, int numContracts, int priceContract)

        {

            double priceInDollars = priceContract / 100.0;

            if (marketID.StartsWith("INX") || (marketID.StartsWith("NASDAQ100"))) {

                return (int)(Math.Round(0.035 * numContracts * priceInDollars * (1.0 - priceInDollars), 2, MidpointRounding.AwayFromZero) * 100);

            } else {

                return (int)(Math.Round(0.07 * numContracts * priceInDollars * (1.0 - priceInDollars), 2, MidpointRounding.AwayFromZero) * 100);

            }

        }

}