$\textbf{Circular Killing}$

One hundred prisoners on the death row are ordered to stand in a circle and are numbered from $1$ to $100$ in sequence. The king then gives a sword to No $1$. No 1 kills the No $2$ and passes the sword to No $3$. The No $3$ then kills No $4$ and passes the sword to the next person alive, i.e. No $5$. All people continuously does the same until only one person survives. Who is the last survivor?