Russia is located in north Asia and the eastern Europe. Russia is  in two continents. The Oural Mountains are the border between Asia  and Europe.
The total cost for a concrete garage floor, including concrete, labor, supplies and equipment, varies region to region because of geographic variables. The total cost for a 400-square-foot garage floor in San Francisco ranges between $3.91 and $4.28 per square foot and between $3.26 and $3.60 per square foot in Atlanta.
Pour concrete footings 1 and slab - Average price of concrete is $75 per cubic yard, with piers and the full slab it that would require roughly 20 cubic yards and would cost at least $1500; Build roof trusses 2 and support beam system and tie into existing house - lumber prices will vary as will the design used by the carpenters constructing the garage.