#456. How many times does the digit 3 appear?
You get a positive integer n. Use `while` to count how many times the digit 3 appears in it.
### Input
One integer n (1 ≤ n ≤ 10¹⁸).
### Output
One integer.
Examples
Input
918824099502914007
Output
0
Input
201403258873719249
Output
2
💡 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.