at foot Liyushan Mountain n tent carefully arrange provide accommodation willing experience joy approach nature tranquility night bright starry skythe ith tent locate point x_i y_i weight w_i a tent important x_i y_i you need remove tent remain important tent x y exist 3 tent x_1 y_1 x_2 y_2 x_3 y_3 condition true x_jx y_j yleq 1 j 1 2 3 tent form parallelogram rectangle side parallel xaxis please maximize sum weight tent remove print maximum value