Bus/SampleExam

using System;

namespace Bus
{
    class Program
    {
        static void Main(string[] args)
        {
            int passengers = int.Parse(Console.ReadLine());
            int stops = int.Parse(Console.ReadLine());
            int count = 0;

            while (count != stops)
            {
                int leftPassengers = int.Parse(Console.ReadLine());
                int newPassengers = int.Parse(Console.ReadLine());
                passengers -= leftPassengers;
                passengers += newPassengers;
                if (count % 2 == 0)
                {
                    passengers += 2;
                }
                else
                {
                    passengers -= 2;
                }

                count++;
            }
            Console.WriteLine($"The final number of passengers is : {passengers}");
        }
    }
}