Vietnam puzzle:

In the hotel we have a room on the sixth floor.

We go from the ground floor into the stairwell and walk up six floors.

When we come out of the stairwell we are on floor eight.

Why is that?

рдЬрд╡рд╛рдл

рднрд┐рдпрддрдирд╛рдо
рдпрд╛рддреНрд░рд╛ рд░рд┐рдкреЛрд░реНрдЯрд╣рд░реВ рднрд┐рдпрддрдирд╛рдо

рдердк рдпрд╛рддреНрд░рд╛ рд░рд┐рдкреЛрд░реНрдЯрд╣рд░реВ