For the first order reaction $\text{A} \rightarrow \text{B} + \text{C}$, carried out at $27^\circ\text{C}$, if $3.8 \times 10^{-16}\%$ of the reactant molecules can overcome the energy barrier, the $E_a$ (activation energy) of the reaction is

[Given: $\log 3.8 = 0.58$, $2.303 \times 8.314 \times 17.42 = 333.33$]