yes ..19 is the correct answer.
p(f1)
/ \
p1 p
(f2) (f2)
/ \ /
\
/ \ /
\
p2 p1 p11
p(f3)
(f4) (f3)
(f4) /\
/ \ /\
/\ / \
/ \ / \
/ \ / \
p3 p2 p6 p1
f5 f5 f4 f5
and so on
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