Description

Now yyy puts a piece of sodium with mass $x\ \text{g}$ into a lot (excess) of water and then starts collecting hydrogen gas.

In the end, we know that this piece of sodium swam around in the water and disappeared. And yyy is very capable and collected all the hydrogen gas.

Known that every $\bm{23}$ grams of sodium added will produce $\bm1$ gram of hydrogen gas.

How many grams of hydrogen did yyy collect?

Formal statement: Given a real number $\bm x$, output $\bm{\frac{x}{23}}$ rounded to $\bm 8$ decimal places.

Input Format

One line containing a real number $x$, representing the mass of sodium that yyy put into the water (unit: $\text{g}$).

There will definitely not be a trailing newline at the end of the input file.

Output Format

One line containing a real number (rounded to $8$ decimal places), representing how many grams of hydrogen gas were produced.

0.23

0.01000000

Hint

Constraints and Notes

For $100\%$ of the testdata, $0 < x \le 1$.

Hint

Do you want to know how many decimal places $x$ has? Not telling you >_<
kkksc: How can there be no constraints! The input file is no more than $5\text M$!
Problem setter: How could you do that! Bad review! Now I can't lay traps!

Warning

Please note that the experiment described in the problem is highly risky. Do not attempt it: the reactive metal $\bold{Na}$ poses safety hazards, $\bold{NaOH}$ is strongly corrosive, and dissolving $\bold{NaOH}$ in water releases a large amount of heat.

Translated by ChatGPT 5