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+--- Day 8: Memory Maneuver ---
+
+The sleigh is much easier to pull than you'd expect for something its weight. Unfortunately, neither
+you nor the Elves know which way the North Pole is from here.
+
+You check your wrist device for anything that might help.  It seems to have some kind of navigation
+system!  Activating the navigation system produces more bad news: "Failed to start navigation
+system. Could not read software license file."
+
+The navigation system's license file consists of a list of numbers (your puzzle input).  The numbers
+define a data structure which, when processed, produces some kind of tree that can be used to
+calculate the license number.
+
+The tree is made up of nodes; a single, outermost node forms the tree's root, and it contains all
+other nodes in the tree (or contains nodes that contain nodes, and so on).
+
+Specifically, a node consists of:
+
+
+ - A header, which is always exactly two numbers:
+
+ - The quantity of child nodes.
+
+ - The quantity of metadata entries.
+
+
+ - Zero or more child nodes (as specified in the header).
+
+ - One or more metadata entries (as specified in the header).
+
+
+
+Each child node is itself a node that has its own header, child nodes, and metadata. For example:
+
+2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2
+A----------------------------------
+    B----------- C-----------
+                     D-----
+
+In this example, each node of the tree is also marked with an underline starting with a letter for
+easier identification. In it, there are four nodes:
+
+
+ - A, which has 2 child nodes (B, C) and 3 metadata entries (1, 1, 2).
+
+ - B, which has 0 child nodes and 3 metadata entries (10, 11, 12).
+
+ - C, which has 1 child node (D) and 1 metadata entry (2).
+
+ - D, which has 0 child nodes and 1 metadata entry (99).
+
+
+The first check done on the license file is to simply add up all of the metadata entries.  In this
+example, that sum is 1+1+2+10+11+12+2+99=138.
+
+What is the sum of all metadata entries?
+
+