1. In A.S. Pushkin's fairy tale "The Priest and His Workman Balda," it is said: "Balda sat on the mare and rode a verst so that the dust rose in a column." Determine how many tens of meters are contained in the length of the path that Balda rode on the mare. $(1$ verst $=500$ sazhen, 1 sazhen $=3$ arshins, 1 arshin $=$ $71 \mathrm{~cm})$.