\displaystyle\begin{gathered} \int_{{B_R}} {\exp \left[ {\frac{{(4\pi - \delta )|\overline u (x)|}}{{{{\left\| f \right\|}_1}}}} \right]dx} \leqslant \int_{{B_R}} {\left[ {\int_{{B_R}} {{{\left( {\frac{{2R}}{{\left| {x - y} \right|}}} \right)}^{2 - \frac{\delta }{{2\pi }}}}\frac{{|f(y)|}}{\|f\|_1}dy} } \right]dx} \hfill \\ \qquad\qquad= \int_{{B_R}} {\left[ {\int_{{B_R}} {{{\left( {\frac{{2R}}{{\left| {x - y} \right|}}} \right)}^{2 - \frac{\delta }{{2\pi }}}}dx} } \right]\frac{{|f(y)|}}{\|f\|_1}dy} . \hfill \\ \end{gathered}