a$,$ b$,$ and c are read from input as floating$-$point values, representing the length, width, and height of a triangular prism. Compute the triangular prism's volume as $($a$*$b$*$c$)/2.$ Use an f$-$string with an $=$ after the expression in the replacement field so that both the expression and the result are printed.

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Ex: If the input is:

$7\mathrm{.}0$

$8\mathrm{.}0$

$4\mathrm{.}0$