Grab and Go

using System;
using System.Linq;

namespace GrabAndGo
{
    class GrabAndGo
    {
        static void Main()
        {
            long[] numbers = Console.ReadLine()
                                   .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                                   .Select(long.Parse)
                                   .ToArray();

            long fix = long.Parse(Console.ReadLine());
            long index = 0;
            long sum = 0;

            for (int i = 0; i < numbers.Length; i++)
            {
                if (numbers[i] == fix)
                {
                    index = i;
                }
            }
            for (int i = 0; i < index; i++)
            {
                sum += numbers[i];
            }
            if (sum == 0)
            {
                Console.WriteLine("No occurrences were found!");
            }
            else
            {
                Console.WriteLine(sum);
            }
        }
    }
}