A simply-supported steel beam made of an I-section has a span of 8 m. The beam is carrying a uniformly distributed load of 15 kN/m. The overall depth of the beam is 450 mm. The moment of inertia of the beam section is 18000 cm\(^4\). The maximum bending stress in the beam will be \(\underline{\hspace{1cm}}\) N/mm\(^2\) (in integer).