|
Remote Training on Programming
|
||||||||||
|
|
|||||||||||
| Hello, Guest! Please login or register. |
1566. Lucky Numbers
|
| View Problem Statistics | Submit | Problem added debug |
|
The numbers of all offices in the new building of the Tax Office of IT City will have lucky numbers. Lucky number is a number that consists of digits 7 and 8 only. Find the maximum number of offices in the new building of the Tax Office given that a door-plate can hold a number not longer than n digits. Input The only line of input contains one integer n (1 ≤ n ≤ 55) — the maximum length of a number that a door-plate can hold. Output Output one integer — the maximum number of offices, than can have unique lucky numbers not longer than n digits. Examples Input 2 Output 6 |
| View Problem Statistics | Submit | Problem discussion | Author/source: |
| Problems from Contests and Camps / | School olympiads and couses of Vologda region / | VolBIT / | VolBIT-2016 / |
| 1565. B - Moore's Law | 1566. | 1567. D - Hexagons! | 1568. E - A Rectangle | 1569. F - Selection of Personnel |
| time generating 0.516 sec. |
| © Copyright VSU, AVT, Nosov D.A., Andrianov I.A. |