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Isosceles Triangle Angle Sum

Triangle $ PQR $ is isosceles and the measure of angle $ R $ is $ 40^\circ $. The possible measures of angle $ P $ are $ x,y,z $. What is the value of the sum $ x + y + z $?

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+
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-
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$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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