// Write a program that reads the sequential heights of a flying plane

// (sequence of positive integers ending with 0) and 

// prints the longest continuous horizontal segment of the flight

using System;

using System.Diagnostics;

public class Program

{

    public static int InputInt(string prompt)

    {

        Console.Write("Enter " + prompt + ": ");

        return Convert.ToInt32(Console.ReadLine());

    }

    public static void Main(string[] args)

    {

        // Inductive extension:

        int h = 0;          // last height

        int max = 0;        // longest horisontal segment (including last one)

        int last_len = 0;   // length of last horisontal segment

        int nextHeight = InputInt("h");

        while (nextHeight != 0)

        {

            if(nextHeight == h)

                last_len++;

            else

            {

                last_len = 1;

                h = nextHeight;

            }

            if(last_len > max)

            {

                max = last_len;

            }

            nextHeight = InputInt("h"); 

        }

        Console.WriteLine("Longest horisontal segment length = " + max);

        // Time = O(sequence length)

    }

}