You are given an integer N that has exactly four digits in base ten. How many times does 2 occur in the base-ten representation of N?

Constraints

• $1000 \leq N \leq 9999$

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer.

Examples

Input

1222

Output

3

Input

3456

Output

0

Input

9592

Output

1

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