$1 - \frac{\sqrt2}{2} + \frac{\pi}{4}$

$\frac{1}{2} + \frac{\pi}{4}$

$2 - \sqrt2 + \frac{\pi}{4}$

$\frac{\sqrt2}{2} + \frac{\pi}{4}$

$1 + \frac{\sqrt2}{4} + \frac{\pi}{8}$