Problem:
Score : 500 points

Problem Statement

Takahashi has a string S of length N consisting of digits from 0 through 9.

He loves the prime number P. He wants to know how many non-empty (contiguous) substrings of S - there are N \times (N + 1) / 2 of them - are divisible by P when regarded as integers written in base ten.

Here substrings starting with a 0 also count, and substrings originated from different positions in S are distinguished, even if they are equal as strings or integers.

Compute this count to help Takahashi.

Constraints

1 \leq N \leq 2 \times 10^5

S consists of digits.

|S| = N

2 \leq P \leq 10000

P is a prime number.

Input

Input is given from Standard Input in the following format:

N P
S

Output

Print the number of non-empty (contiguous) substrings of S that are divisible by P when regarded as an integer written in base ten.

Sample Input 1

4 3
3543

Sample Output 1

6

Here S = 3543. There are ten non-empty (contiguous) substrings of S:

3: divisible by 3.

35: not divisible by 3.

354: divisible by 3.

3543: divisible by 3.

5: not divisible by 3.

54: divisible by 3.

543: divisible by 3.

4: not divisible by 3.

43: not divisible by 3.

3: divisible by 3.

Six of these are divisible by 3, so print 6.

Sample Input 2

4 2
2020

Sample Output 2

10

Here S = 2020. There are ten non-empty (contiguous) substrings of S, all of which are divisible by 2, so print 10.

Note that substrings beginning with a 0 also count.

Sample Input 3

20 11
33883322005544116655

Sample Output 3

68

Solution in PyPy3 (7.3.0) (judge verdict: Accepted)

n,p=map(int,input().split())
s=input()
total=[0]*p#pで割った余りで分類
total[0]=1#t[0]=0の分をあらかじめカウント
t=[0]*(n+1)#s[i:n]を格納する用の配列
if p==2 or p==5:
    ans=0
    for i in range(n):
        if int(s[i])%p==0:
            ans+=i+1
    print(ans)
else:
    for i in range(n-1,-1,-1):
        t[i]=t[i+1]%p+int(s[i])*pow(10,n-1-i,p)#s[i:n]を漸化式で付け加えていく
        total[t[i]%p]+=1
    ans=0
    for i in range(p):
        ans+=total[i]*(total[i]-1)//2
    print(ans)