A pile of dia $0.4\text{m}$ fully embedded in a clay strata having 5 layers; each $5\text{m}$ thick as shown in fig. Assuming a constant unit weight of soil $18{\text{kN/m}}^3$ for all the layers using $\lambda$- method ($\lambda =0.15$ for $25\text{m}$ embedment length) and neglecting the end bearing components the ultimate beam capacity (in kN) is

1. 1625.77