PROGRAMMING:Finding the approximate value of E by loop (exercise 6-7, fundamentals and applications of Python programming, Higher Education Society)

Write a program, read K from the keyboard, calculate the approximate value of E (retain 10 decimal places).
###Input format:
\>The positive integer k of 5
###Output format:
Approximate value of E (10 decimal places reserved)
###Input example:
```in
six
```
###Output example:
```out
two point seven one eight zero five five five five five six
```







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