Hasta La Motion!

I have a text node which I want to print out the current seconds. My expression is very simple:
int[[frame]/[knob root.fps]] the problem is that I cant write it in the text message because it read the (/) as symbol and not as divider between the current frame and the fps. Then I created a user knob in the shame text node, a simple integer which was able to read the above expression and give me the result. But when I linked this knob with my message field, prints the expression and not the result.

Does anyone knows how to fix that, I will be interest to know
1. how can I use mathematical symbols as (+, -, / etc.) in the text node.
2. how can I link the result of an expression in the text node and not the expression itself.

thanks