We define a function $$$f(x)$$$.And we know the function expression as following.

ps. $$$e$$$ means the natural base. We will give you an interger $$$x(0 \lt x \lt =1*10^7)$$$.Please give us the $$$f(x)$$$ in 2 seconds.

For example

Input1

14

Output1

38

Input2

5

Output2

3

Thanks for my friend Kevin.He solved this problem and taught me how to solve it.