}

In a 15-story building, there is an elevator with two buttons: "+7" and "-9" (see problem 31354). Can you travel from the 3rd floor to the 12th?

#
First method. From the 3rd floor, in one "move" you can only get to the 10th, from there - only to the 1st, then - to the 8th, to the 15th, to the 6th, to the 13th, to the 4th, to the 11th, to the 2nd, and finally to the 9th. And from the 9th floor, you can't go anywhere.

Second method. To the 12th floor in one "move," you can only get from the 5th, there - only from the 14th, there - only from the 7th. And to the 7th floor, you can't get from anywhere.

## Answer

It is not possible.