SoftUni - 4.11* Numbers Divided by 5

//Write a program that reads two positive integer numbers and prints how many numbers p exist between them such that the reminder of the division by 5 is 0.

using System;

class NumbersDev5
{
    static void Main()
    {
        Console.Write("Enter Start number = ");
        string one = Console.ReadLine();
        int start = int.Parse(one);

        Console.Write("Enter End number = ");
        string second = Console.ReadLine();
        int end = int.Parse(second);

        int p = 0;

        if (start <= 0 || end < start)
        {
            Console.WriteLine("Enter positive numbers, greater than 0.");
        }
        else
        {
            for (int i = start; i <= end; i++)
            {
                if (i % 5 == 0)
                {
                    p++;
                }
            }
            Console.WriteLine("p = " + p);
        }
    }
}