bash - how to extract the remaining memory from free using awk? -

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i need extract available memory output free , thought use awk , came free | awk '{print $4}'. gives me output like:

$ free | awk '{print $4}' shared 365296 1273812 3931364

mind, title shared isn't title of these numbers, numbers free (/usr/bin/free has no title in first column, numbers free appear in 4th column title reported 5th). however, having this, how return second line? i'm not interested in rest now.

free | awk 'nr==2 {print $4}'

nr, row/line number


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