1.
The value of tan1(13)+tan1(15)+tan1(17)+tan1(18)\tan^{-1} \left(\frac{1}{3}\right) + \tan^{-1} \left(\frac{1}{5}\right) + \tan^{-1} \left(\frac{1}{7}\right) + \tan^{-1} \left(\frac{1}{8}\right) is