December17th2017 Workout C#

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

namespace T4WorkoutCode2
{
    class Program
    {
        static void Main(string[] args)
        {

            var countOfDay = int.Parse(Console.ReadLine());
            var M = double.Parse(Console.ReadLine());
            var S = M;
            for (int i = 1; i <= countOfDay; i++)
            {
                var k = double.Parse(Console.ReadLine());
                M += k / 100.0 * M;
                S += M;
            }
            var S1 = S - 1000;
            var S2 = Math.Abs(S1);
            if (S1 >= 0)
            {
                Console.WriteLine($"You've done a great job running {Math.Ceiling(S2)} more kilometers!");
            }
            else
            {
                Console.WriteLine($"Sorry Mrs. Ivanova, you need to run {Math.Ceiling(S2)} more kilometers");
            }
        //main ends here
        }
    }
}