Elevator

The panel house has ten over-ground floors and four underground. The lift goes from the ground floor to 2nd floors, then goes down to 3rd underground floors, then 9 floors up and finally 4 floors down. To what story elevator come? How many floors did it cross over?

Correct result:

a =  2
b =  20

Solution:

$a=-3+9-4=2$
$b=0+2+(2+3)+9+4=20$

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