Consider two points $A0$ and $A1$ which are on a unit circle C centered at origin. Where point $A0$ is $(1,0)$ and $A1$ is such that angle between positive direction of X-axis and radius vector through $A1$ is 1°.
The points $Ai$ (i>=2) are obtained in the following way :
Consider vector $Vi = A(i-1) - A(i-2)$, if $A(i-1)$ and $A(i-2)$ coincide take $V$ as the tangent at $A(i-1)$. Ai is obtained by intersection of circle with line which passes through Point $A0$ $(1,0)$ and is parallel to $Vi$.

find the angle between X-axis and radius vector through $An$ for n=123456789987654321. Give answer in degrees (Only output the integral part of the answer, if your answer is 19.23 enter 19 (19.0 will be wrong)).