the circle line Roflanpolis subway n stationsthere parallel route subway the visit station order 1 2 ldot n 1 2 ldot stop station x equal x1 x n 1 the second route visit station order n n1 ldot 1 n n1 ldot stop station x equal x1 x1 n all train depart station simultaneously take exactly 1 minute arrive stationtwo toad live city name Daniel VladDaniel currently train route station exit subway train reach station xCoincidentally Vlad currently train second route station b exit subway train reach station ySurprisingly number axby distincttoad Ilya ask check Daniel Vlad station time journey in word check moment train stop station Note include moment Daniel Vlad enter leave subway