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 $$$x(0<x<=1*10^7)$$$.Please give us the $$$f(x)$$$ in 2 seconds.
Can anyone help me?This question has puzzled me for a long time.Thanks.
For example
Input1
14
Output1
38
Input2
5
Output2
3