If the maximum value of the term independent of $t$ in the expansion of $\left(\mathrm{t}^{2} x^{\frac{1}{5}}+\frac{(1-x)^{\frac{1}{10}}}{\mathrm{t}}\right)^{15}, x \geqslant 0$, is $\mathrm{K}$, then $8 \mathrm{~K}$ is equal to ____________.