Force problem

[TheShapeOfTime]

If I am holding a 10.0 kg book against the wall with a 30 degree angle between the book and my arm (angle measured closest to my hand out), how can I find the force (in Newtons) that I'm pushing with?

[Pyrrhus]

Is the wall frictionless??

[TheShapeOfTime]

Just to make sure we understand eachother: I'm holding the book against the wall by leaning on it with my hand, applying a force at a 30 degree (measured as stated in my OP).

My understanding is that there has to be some friction against the wall otherwise I wouldn't be able to hold it there?