EcualSum

using System;
using System.Linq;
namespace EcualSum
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] array = Console
                .ReadLine()
                .Split()
                .Select(int.Parse)
                .ToArray();
            int leftSum = 0;
            int rightSum = 0;
            int counter = 0;

            if (array.Length == 1)
            {
                Console.WriteLine(0);
                return;
            }

            for (int i = 0; i < array.Length - 1; i++)
            {
                leftSum += array[i];
                counter++;
                for (int u = i + 2; u < array.Length; u++)
                {
                    rightSum += array[u];
                    if (rightSum > leftSum)
                    {
                        break;
                    }
                }
                if (leftSum == rightSum)
                {
                    Console.WriteLine(counter);
                    return;
                }
                else
                {
                    rightSum = 0;
                }
            }
            Console.WriteLine("no");
        }
    }
}