public static int Part1()
{
var input = Input.ReadLines(day: 17);
var cycle0 = PocketDimension3d.Parse(input);
var cycle1 = cycle0.Next();
var cycle2 = cycle1.Next();
var cycle3 = cycle2.Next();
var cycle4 = cycle3.Next();
var cycle5 = cycle4.Next();
var cycle6 = cycle5.Next();
return(cycle6.ActiveCells.Count);
}