Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

1222

Sample Output 1

3

2 occurs three times in 1222. By the way, this contest is held on December 22 (JST).

Sample Input 2

3456

Sample Output 2

0

Sample Input 3

9592

Sample Output 3

1

Solution in PyPy3 (2.4.0) (judge verdict: Runtime Error)

import math
from sys import stdin
N,P=[int(x) for x in stdin.readline().rstrip().split()]
for i in reversed(range(round(math.pow(P,(1/N)))):
    tmp=math.pow(i,N-1)
    if P==1:
        ans=1
        break
    if N==1:
        ans=P
        break
    if (P/i)%tmp==0:
        ans=i
        break
print(ans)