Tryk0tvzhn0e vetelie Lc Scclc, 8yazhem p0 indi8iduvlnym 3vkv3vm, Lugvnsk, Ukraine

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In the mathematics lesson, the teacher explains the condition of the task: "The staircase of the house under construction(//tractor-service.com)
has five spans, each of which consists of 20 steps. How many steps
do you have to pass to get to the last floor?
- Everything, - answers Vovochka.