The Taylor series of the function e^{x} is
e^{x} = 

 . 
Note that this series has an infinite number of terms. However, for any x we can get an approximation of e^{x} by adding some of the first terms of the series (of course, the more terms, the better the result). In particular, chosing x = 1 gives us a method to compute e ≃ 2′71828182845904523536:
e = 

 . 
Write a program that, for every given natural number n, prints the approximation of e that we get by adding the n first terms of the series above.
Input
Input consists of several natural numbers n between 0 and 20.
Output
For every given n, print with 10 digits after the decimal point the approximation of e that we get by adding the n first terms of the series above.
Observation
Because of overflow reasons, do all the computations for this exercise using real numbers.
Input
0 1 3 20
Output
With 0 term(s) we get 0.0000000000. With 1 term(s) we get 1.0000000000. With 3 term(s) we get 2.5000000000. With 20 term(s) we get 2.7182818285.