这段程序会输出什么？

using System;

var meter = new Meter { Level = 3 };
Console.WriteLine($"{meter.Level}:{meter.Reads}");

public sealed class Meter
{
    private int _level;
    public int Reads { get; private set; }

    public int Level
    {
        get
        {
            Reads++;
            return _level;
        }
        set => _level = value * 2;
    }
}