Any three non collinear points define a plane.
Here the base itself is on the plane HXBN
So that is one plane.
J, X, B are non collinear points and form the triangle JXB.
This triangle also defines a plane.
J, N , B are another triplet of non collinear points making triangle JNB.
So JNB defines the third plane.
J, H, N are three non collinera points making triangle JHN.
So JHN defines the fourth plane.
Finally J, H, X are non collinear points which make the triangle JHX.
JHX defines the fifth plane.
Hence there are 5 planes in all in the given figure.