Equal Sums

using System;
using System.Linq;


namespace EqualSums
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            int[] arr = Console.ReadLine()
                               .Split(' ')
                               .Select(int.Parse)
                               .ToArray();
            int leftSum  = 0;
            int rightSum = 0;
            bool isEqual = false;

            for (int i = 0; i < arr.Length ; i++)
            {
                for (int left = 0; left < i; left++)
                {
                    leftSum += arr[left];
                }
                for (int right = i + 1; right < arr.Length; right++)
                {
                    rightSum += arr[right];
                }
                if (leftSum == rightSum)
                {
                    Console.WriteLine(i);
                    isEqual = true;
                    break;
                }
                leftSum  = 0;
                rightSum = 0;
            }
            if (!isEqual)
            {
                Console.WriteLine("no");
            }
        }
    }
}