gather darkness shroud wood world the moon shed light boat riverto curtain moonlight hardly possible shade present mellow beauty restful nature Intonates MinoSee the cloud come Kanno gaze distancethat can not well Mino turn Kanno the sky see onedimensional axis the moon origin coordinate 0There n cloud float sky each cloud length l the ith initially cover range x_i x_i l endpoint exclude Initially move velocity v_i equal 1 1furthermore pair cloud intersect initially 1 leq lt j leq n lvert x_i x_j rvert geq lwith wind velocity w velocity ith cloud v_i w that coordinate increase v_i w unit time Note wind strong cloud change directionyou help Mino count number pair j j proper choice wind velocity w exceed w_mathrmmax absolute value possibly negative andor fractional ith jth clouds cover moon future moment this w do not need different pair