using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var adventurer = new Person

        {

            FirstName = "Ragnar",

            LastName = "Sigrudson",

            Age = 27,

            Luck = 0

        };

    }

}

​

​

public class Person

{

    public String FirstName { get; set; }

    public String LastName { get; set; }

    public int Age { get; set; }

    public int Luck { get; set; }

    public Person IncreaseLuck(int amount)

    {

        this.Luck += amount;

        return this;

    }

    public Person DecreaseLuck(int amount)

    {

        this.Luck -= amount;

        return this;

    }

    public Person IncreaseAge(int amount)

    {

        this.Age += amount;

        return this;

    }

    public Person DecreaseAge(int amount)

    {

        this.Age -= amount;

        return this;

    }

}

​