// The Moscow Ring Road (MKAD) has a length 109 km. 

// Biker Ivan starts with “0 km” mark and goes with a constant speed of v km/hour.

// What mark will he pass in t hours?

// The program should input two integer numbers v≠0 and t≥0 and print

// integer number in range 0..108 (the mark where Ivan will be after t hours).

// Negative v means that Ivan goes in opposite direction (0->108->107 etc)

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)

    {

        const int mkad = 109; // The Moscow Ring Road length

        // input data

        int v = InputInt("the speed");

        int t = InputInt("the time");

        Trace.Assert(t >= 0);

        // calculate (see https://en.wikipedia.org/wiki/Modulo_operation)

        int mark = (mkad + (v*t) % mkad) % mkad;

        // output result

        Console.WriteLine("Ivan will be at mark " + mark);

    }

}