## Introduction

The number e is of interesting origin. e is called Euler’s number, but also sometimes called Napier’s constant. You may be interested to know that neither of these gentleman actually discovered the number in the first place. John Napier is named because e was often found in his work while Leonhard Euler ended up choosing the symbol although the true discoverer was Jacob Bernoulli.

**Input: **

none

**Output:**

Output the number e accurate to 15 decimal places. If you are interested in retaining this information, think of Andrew Jackson who served 2 terms as the 7th president, his first term being in 1828, then 1828 again because he served 2 terms. Legend has it he has two 45 caliber pistols which make 90 calibers in total. Stick all those numbers together, and you get the first 16 digits of e, 2.718281828459045.

## Sample Output

```
2.718281828459045
```