memory value?

can someone tell me what the following means to me in MB of memory (this is on my VPS)

Mem: 4005812K av, 3873616K used, 132196K free, 0K shrd, 104156K buff
Swap: 4194272K av, 3631916K used, 562356K free 1392392K cached

thanks in advance

 

 

 

 

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