using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine( getFrogJumps(10,85,30));

    }

    public static int getFrogJumps(int X, int Y, int D)

    {

        if (X == Y)

            return 0;

​

        //return (int)Math.Ceiling((double)(Y-X) / D);

        //or 

         int dist = Y - X;

​

        if( dist % D == 0)

            return dist / D;

        else

            return dist / D + 1; 

    }

​

}