#421. Trailing zeros of n!
You get n. How many zeros are at the end of n!? (Hint: divide by 5.)
### Input
One integer n (0 ≤ n ≤ 10⁹).
### Output
A number.
Examples
Input
326222078
Output
81555515
Input
734438039
Output
183609505
💡 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.