using System;

public class Program

{

    public static void Main()

    {

        int[] nums = new int[] {20, -2, 6, 2, 1, 3};

        int num = 9;

        if(Above(nums, num) != -1)

            Console.WriteLine("The index of the number that the total of the numbers behind him is bigger that {0} is the {1}.", num, Above(nums, num));

        else

            Console.WriteLine("There was no total number bigger than {0}.", num);

    }

    public static int Above(int[] arr, int n)

    {

        int sum = arr[0], index = 0;

        for(int i = 1; i < arr.Length; i++)

        {

            if(sum > n)

            {

                index = i;

                return index;

            }

            else

                sum += arr[i];

        }

        return -1;

    }   

}