the leader secretive organization decide invite member meet all member organization live town represent n crossroad connect m twodirectional street the meeting hold leader house near crossroad 1 there k member organization invite meet ith life near crossroad a_i all member organization receive message meeting moment start move location meeting hold in begin minute person locate crossroad he wait minute crossroad spend minute walk current crossroad street crossroad obviously possible start walk street begin end current crossroad in begin minute person crossroad live as soon person reach crossroad number 1 immediately come leader house attend meetingobviously leader want member organization come early possible but organization secretive leader want attract attention Lets denote discontent leader follow initially discontent 0 person reach crossroad number 1 discontent leader increase c cdot x c fix constant x number minute take person reach crossroad number 1 x member organization walk street moment direction dx2 add discontent d fix constant this cumulative example person walk street direction moment 4d add discontent 5d before send message meeting leader tell member organization path choose wait help leader establish plan member organization reach crossroad 1 discontent minimize