#include <bits/stdc++.h>
#define range(i, l, r) for(long long int (i) = (l); (i) < (r); (i)++)
#define reversed_range(i, l, r) for (long long int (i) = (r) - 1; (i) >= l; (i)--)
using namespace std;
template <typename T>
using vec = vector<T>;
using lint = long long;
using ulint = unsigned long long;
using pint = pair<int, int>;
using plint = pair<lint, lint>;

template <typename S, typename T>
ostream& operator <<(ostream& os, pair<S, T> p) {
    os << "(";
    os << p.first << ", " << p.second;
    return os << ")";
}

template <typename T>
ostream& operator <<(ostream& os, vec<T> v) {
    os << "[";
    if (v.size() == 0) return os << "]";
    for (int i = 0; i < v.size() - 1; i++) {
        os << v.at(i) << ", ";
    }
    return os << v.at(v.size() - 1) << "]";
}

template <typename T>
ostream& operator <<(ostream& os, set<T>& s) {
    os << "{";
    if (s.begin() == s.end()) return os << "}";
    auto it_first_item = s.begin();
    os << *it_first_item;
    for (auto it = ++it_first_item; it != s.end(); it++) {
        os << ", " << *it;
    }
    return os << "}";
}

template <typename T>
ostream& operator <<(ostream& os, unordered_set<T>& s) {
    os << "{";
    if (s.begin() == s.end()) return os << "}";
    auto it_first_item = s.begin();
    os << *it_first_item;
    for (auto it = ++it_first_item; it != s.end(); it++) {
        os << ", " << *it;
    }
    return os << "}";
}

template <typename K, typename V>
ostream& operator <<(ostream& os, map<K, V> m) {
    os << "{";
    if (m.begin() == m.end()) return os << "}";
    auto it_first_item = m.begin();
    os << it_first_item->first << ": " << it_first_item->second;
    for (auto it = ++it_first_item; it != m.end(); it++) {
        os << ", " << it->first << ": " << it->second;
    }
    return os << "}";
}

template <typename K, typename V>
ostream& operator <<(ostream& os, unordered_map<K, V> m) {
    os << "{";
    if (m.begin() == m.end()) return os << "}";
    auto it_first_item = m.begin();
    os << it_first_item->first << ": " << it_first_item->second;
    for (auto it = ++it_first_item; it != m.end(); it++) {
        os << ", " << it->first << ": " << it->second;
    }
    return os << "}";
}

lint pow(lint num, lint e, lint MOD) {
    lint res = 1;
    lint cur_num = num;
    while (e) {
        if (e & 1) {
            res *= cur_num;
            res %= MOD;
        }
        cur_num *= cur_num;
        cur_num %= MOD;
        e >>= 1;
    }
    return res;
}

int main() {
    cin.tie(0); cout.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    lint N, P; cin >> N >> P;
    string S; cin >> S;
    reverse(S.begin(), S.end());
    // cout << S << "\n";
    // not sure this is necessary.
    if (P == 2 or P == 5) {
        unordered_set<lint> effective_digits;
        if (P == 2) effective_digits = {0, 2, 4, 6, 8};
        else effective_digits = {0, 5};
        lint count = 0;
        range(i, 0, N) {
            bool is_effective = effective_digits.count(S.at(i) - '0');
            lint remaining_digits = N - i;
            if (is_effective) count += remaining_digits;
        }
        cout << count << "\n";
        return 0;
    }
    vec<lint> count(P, 0);
    lint cur_r = 0, cur_pow = 1;
    range(i, 0, N) {
        lint d = S.at(i) - '0';
        cur_r += d * cur_pow;
        cur_r %= P;
        count.at(cur_r) += 1;
        cur_pow *= 10;
        cur_pow %= P;
    }
    // cout << count << "\n";
    lint ans = 0;
    cur_r = 0, cur_pow = 1;
    range(i, 0, N) {
        ans += count.at(cur_r);
        // cout << cur_r << " " << ans << "\n";
        lint d = S.at(i) - '0';
        cur_r += d * cur_pow;
        cur_r %= P;
        count.at(cur_r) -= 1;
        cur_pow *= 10;
        cur_pow %= P;
        // cout << count << "\n";
    }
    cout << ans << "\n";
}

Measured memory_bytes: 720