\sum\limits_{z}{{{\nu }_{z}}{{{{\omega }'_{z}}}}\left( {{\pi }_{S}}\left( \gamma \left( {{\pi }_{S}} \right)>0 \right) \right)-\omega \left( {{\pi }_{S}}\left( \gamma \left( {{\pi }_{S}} \right)>0 \right) \right)