PROGRAMMING:Finding the value of e

Write a program to calculate $$e = 1 + \ frac1 {1!} +\ frac1{2!}+...+ \ frac1{n!}$$ 。 Requirement: make the last $$\ frac1 {n!}$$ The value of is less than or equal to the given $$\ epsilon $$to end the operation (Note: the last item $$\ frac1 {n!})$$ The value of (epsilon $$) is entered from the keyboard.
###Input format:
Enter a value for $$\ epsilon $$.
###Output format:
Output the value of 'e'.
###Input sample 1:
```in
zero point zero zero zero zero one
```
###Output sample 1:
```out
e=2.718279
```
###Input sample 2:
```in
zero point zero zero one
```
###Output sample 2:
```out
e=2.718056
```







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