using System;

public class Test
{
    
    class Person
{
    public int age;
    public Person()
    {
        age = 1;
    }
}

class Customer : Person
{
    public Customer()
    {
        age += 1;
    }
}

	public static void Main()
	{
		var c = new Customer();
        Console.WriteLine(c.age);
	}
}