#310. Harmonic sum
You get n. Print the sum 1 + 1/2 + 1/3 + ... + 1/n with 3 decimal places.
### Input
One integer n (1 ≤ n ≤ 1000).
### Output
A decimal number.
Examples
Input
558
Output
6.902
Input
818
Output
7.285
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.