using System;

public class Program

{

    public static void Main()

    {

        const int defaultValue = 0;

        var inputString = Console.ReadLine();

        // this is it - one-liner with explicit intent with the ability to pick a default value

        var inputInt = int.TryParse(inputString, out var result) ? result : defaultValue;

        Console.WriteLine(inputInt);

    }

}