A 317 mm diameter pile is being designed with a factor of safety of 2 at a site where the soil consists of medium clay (C = 60 kPa) to a depth of 12 m. Below this is a layer of stiff clay (Cu = 181kPa). If the adhesion factor for medium clay is 60 % and that of stiff clay is 80%, compute the allowable pile capacity (kN) if the pile penetrates 4 m into stiff clay layer (2 d.p)