Equal_Sum

using System;
using System.Linq;

namespace P06_Equal_Sum
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] input = Console.ReadLine()
                .Split()
                .Select(int.Parse)
                .ToArray();
            for (int i = 0; i < input.Length; i++)
            {
                int leftSum = 0;
                int rightSum = 0;
                for (int j = 0; j < i; j++)
                {
                    leftSum += input[j];
                }
                for (int k = i + 1; k < input.Length; k++)
                {
                    rightSum += input[k];
                }
                if(leftSum == rightSum)
                {
                    Console.WriteLine(i);
                    return;
                }
            }
            Console.WriteLine("no");
        }
    }
}