Tree Sum is Fun !

You're given an infinite binary tree called $\textbf{Funny Tree}$. This tree has one vertex labeled with every positive integer, and the children of the vertex labeled $i$ are the vertices labeled $2i$ and $2i+1$. The first $15$ nodes of the tree are depicted in the image below. MathModel selects a node $u$ and an integer $N$. Starting from node $u$, MathModel will repeatedly move to the parent n