linux - Server Free Memory

My Redhat server shows the following:

free -m 
============= 
             total       used       free     shared    buffers     cached 

Mem:          8113       8078        35          0        171       6491   
-/+ buffers/cache:       1415       6698   
Swap:         8189         59       8130

Is 35 mega of free memory considered critical on a production server ?

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