using System;
using System.Collections.Generic;

public class CustomEvent
{
    private readonly List<Action> events;

    public CustomEvent(int capacity = 1)
    {
        events = new List<Action>(capacity);
    }

    public event Action Event
    {
        add { events.Add(value); }
        remove { events.Remove(value); }
    }

    public void Execute()
    {
        for (var i = 0; i < events.Count; ++i)
        {
            if (events[i] != null)
            {
                events[i]();
            }
        }
    }
}

public class CustomEvent<T>
{
    private readonly List<Action<T>> events;

    public CustomEvent(int capacity = 1)
    {
        events = new List<Action<T>>(capacity);
    }

    public event Action<T> Event
    {
        add { events.Add(value); }
        remove { events.Remove(value); }
    }

    public void Execute(T value)
    {
        for (var i = 0; i < events.Count; ++i)
        {
            if (events[i] != null)
            {
                events[i](value);
            }
        }
    }
}