Workout

using System;

namespace Workout
{
    class Program
    {
        static void Main(string[] args)
        {
            int daysToRun = int.Parse(Console.ReadLine());
            double kmFirstDay = double.Parse(Console.ReadLine());

            double kmPerDay = kmFirstDay;
            double kmTotal = kmFirstDay;

            for (int i = 0; i < daysToRun; i++)
            {
                int percentage = int.Parse(Console.ReadLine());

                kmPerDay += kmPerDay * ((double)percentage / 100);
                kmTotal += kmPerDay;
            }

            double difference = Math.Abs(kmTotal - 1000);
            difference = Math.Ceiling(difference);

            if (kmTotal >= 1000)
            {
                Console.WriteLine($"You've done a great job running {difference} more kilometers!");
            }
            else
            {
                Console.WriteLine($"Sorry Mrs. Ivanova, you need to run {difference} more kilometers");
            }
        }
    }
}