$$\left. \begin{array} { l } { 0 \leq f t r i g i n t a t u g u t a t } \\ { a } \\ { b \ln a , } \\ { m = 5 , r = 4 } \end{array} \right.$$
$$25*e*eRi*m^2*a^2*k*t*h*n^3*d^2*r$$