Student Cables - my solution

using System;

public class Program
{
    public static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int[] length = new int[n];
        string[] unit = new string[n];

        for(int i = 0; i < n; i++)
        {
            length[i] = int.Parse(Console.ReadLine());
            unit[i] = Console.ReadLine();
        }


        int[] result = new int[n];
        for(int j = 0; j < n; j++)
        {
            if(unit[j] == "meters")
            {
                result[j] = length[j] * 100;
            }
            else if(unit[j] == "centimeters")
            {
                result[j] = length[j];
            }
        }

        int sum = 0;
        int plus = 0;
        for(int k = 0; k < n; k++)
        {
            if(result[k] >= 20)
            {
                sum = sum + result[k];
                plus++;
            }
        }

        sum = sum - (3 * (plus - 1));
        int SumCables = (int)(sum / 504);
        int remaining = sum % 504;

        Console.WriteLine(SumCables);
        Console.WriteLine(remaining);
    }
}