$${Q = (m_{\pi} c^2 + m_p c^2) - (m_K c^2 + m_{\Sigma} c^2) = (139,6\, \mathrm{MeV} \\ + 938,3\, \mathrm{MeV}) - (493,7\, \mathrm{MeV} + 1189,4\, \mathrm{MeV}) \\ = \underline{\underline{-605\, \mathrm{MeV}}}}$$