MathDB

The hotel has

13

rooms with rooms from

1

13

, located on one side of a straight corridor in ascending order of numbers. During the tourist season, which lasts from May

1

st to October

1

st, the hotel visitor has the opportunity to rent either one room for two days in a row, or two adjacent rooms together for one day. How much could a hotel owner earn in a season if it is known that on October

1

, rooms

1

and

13

were empty, and the payment for one room was one tugrik per day?

Problem Statement