(1)
" ". . , , ... : ☼ (.. ), ☼ ( , ) 300 , ☼ 2 . .( , ), ☼ x 1 . (2 . .), ☼ 1 . ., ☼ 1/2 . . : , . ( ) . , . 8 10 . , . ( ) . 210 220 15 20 . . !