// File generated on 24/11/13 21:19 by Anand

#include <bits/stdc++.h>
using namespace std;

#define fastio ios::sync_with_stdio(false); cin.tie(0)
#define rep(i, m, n)  for (long long i = m; i < n; i++)
#define DEBUG(x) cout << "debug: " << x << "\n"
#define YES cout << "YES\n"
#define NO cout << "NO\n"
#define pb push_back
#define sz size

typedef long long ll;
typedef pair<ll,ll> pll;
typedef vector<ll> vec;
typedef vector<vec> vecc;
typedef vector<pll> vecp;

void SOLVE() {
    ll n, k;
    cin >> n >> k;
    ll c = 0;
    ll x = 1;
    ll m = 0;
    rep(i,1,min(10ll, n+1)) {
        m = (m * 10 + i) % k;
        if (m%k == 0) c++;  
    }

    rep(i, 10, min(100ll, n+1)) {
        m = (m * 100 + i) % k;
        if (m%k == 0) c++;
    }

    rep(i, 100, min(1000ll, n+1)) {
        m = (m * 1000 + i) % k;
        if (m%k == 0) c++;
    }

    rep(i, 1000, min(10000ll, n+1)) {
        m = (m * 10000 + i) % k;
        if (m%k == 0) c++;
    }

    rep(i, 10000, min(100000ll, n+1)) {
        m = (m * 100000 + i) % k;
        if (m%k == 0) c++;
    }

    cout << c << "\n";
}

signed main() {
    fastio;

		SOLVE();

    return 0;
}