using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

using System.IO;

public class Program

{

        public static void Main(string[] args)

        {

            Console.WriteLine(solution(-10000, 10000).ToString());

        }

​

​

        public static int solution(int A, int B)

        {

            // write your code in C# 6.0 with .NET 4.5 (Mono)

            int result = 0;

            int[] integerRange = Enumerable.Range(A, B - (A-1)).Where(i => i > 0).ToArray();

​

            for(int counter = 0; counter < integerRange.Count(); counter++)

            {

                double root = Math.Sqrt(integerRange[counter]);

                if (root == (int)root)

                    result++;

​

            }

​

            return result;

​

        }

}