#include <bits/stdc++.h>
// #include <bits/extc++.h>
// using namespace __gnu_pbds;
using namespace std;
//#pragma GCC optimize(3)
#define DB double
#define LL long long
#define ULL unsigned long long
#define in128 __int128
#define cint const int
#define cLL const LL
#define For(z,e1,e2) for(int z=(e1);z<=(e2);z++)
#define Rof(z,e1,e2) for(int z=(e2);z>=(e1);z--)
#define For_(z,e1,e2) for(int z=(e1);z<(e2);z++)
#define Rof_(z,e1,e2) for(int z=(e2);z>(e1);z--)
#define inint(e) scanf("%d",&e)
#define inll(e) scanf("%lld",&e)
#define inpr(e1,e2) scanf("%d%d",&e1,&e2)
#define in3(e1,e2,e3) scanf("%d%d%d",&e1,&e2,&e3)
#define outint(e) printf("%d\n",e)
#define outint_(e) printf("%d%c",e," \n"[i==n])
#define outint2_(e,e1,e2) printf("%d%c",e," \n"[(e1)==(e2)])
#define outll(e) printf("%lld\n",e)
#define outll_(e) printf("%lld%c",e," \n"[i==n])
#define outll2_(e,e1,e2) printf("%lld%c",e," \n"[(e1)==(e2)])
#define exc(e) if(e) continue
#define stop(e) if(e) break
#define ret(e) if(e) return
#define ll(e) (1ll*(e))
#define pb push_back
#define ft first
#define sc second
#define pii pair<int,int> 
#define pli pair<LL,int> 
#define vct vector 
#define clean(e) while(!e.empty()) e.pop()
#define all(ev) ev.begin(),ev.end()
#define sz(ev) ((int)ev.size())
#define debug(x) printf("%s=%d\n",#x,x)
#define x0 __xx00__
#define y1 __yy11__
#define ffo fflush(stdout)
cLL mod=998244353,G=404;
// cLL mod[2]={1686688681ll,1888686661ll},base[2]={166686661ll,188868881ll};
template <typename Type> void get_min(Type &w1,const Type w2) { if(w2<w1) w1=w2; } template <typename Type> void get_max(Type &w1,const Type w2) { if(w2>w1) w1=w2; }
template <typename Type> Type up_div(Type w1,Type w2) { return (w1/w2+(w1%w2?1:0)); }
template <typename Type> Type gcd(Type X_,Type Y_) { Type R_=X_%Y_; while(R_) { X_=Y_; Y_=R_; R_=X_%Y_; } return Y_; } template <typename Type> Type lcm(Type X_,Type Y_) { return (X_/gcd(X_,Y_)*Y_); }
template <typename Type> Type md(Type w1,const Type w2=mod) { w1%=w2; if(w1<0) w1+=w2; return w1; } template <typename Type> Type md_(Type w1,const Type w2=mod) { w1%=w2; if(w1<=0) w1+=w2; return w1; }
void ex_gcd(LL &X_,LL &Y_,LL A_,LL B_) { if(!B_) { X_=1ll; Y_=0ll; return ; } ex_gcd(Y_,X_,B_,A_%B_); X_=md(X_,B_); Y_=(1ll-X_*A_)/B_; } LL inv(LL A_,LL B_=mod) { LL X_=0ll,Y_=0ll; ex_gcd(X_,Y_,A_,B_); return X_; }
template <typename Type> void add(Type &w1,const Type w2,const Type M_=mod) { w1=md(w1+w2,M_); } void mul(LL &w1,cLL w2,cLL M_=mod) { w1=md(w1*md(w2,M_),M_); } template <typename Type> Type pw(Type X_,Type Y_,Type M_=mod) { Type S_=1; while(Y_) { if(Y_&1) mul(S_,X_,M_); Y_>>=1; mul(X_,X_,M_); } return S_; }
template <typename Type> Type bk(vector <Type> &V_) { auto T_=V_.back(); V_.pop_back(); return T_; } template <typename Type> Type tp(stack <Type> &V_) { auto T_=V_.top(); V_.pop(); return T_; } template <typename Type> Type frt(queue <Type> &V_) { auto T_=V_.front(); V_.pop(); return T_; }
template <typename Type> Type bg(set <Type> &V_) { auto T_=*V_.begin(); V_.erase(V_.begin()); return T_; } template <typename Type> Type bk(set <Type> &V_) { auto T_=*prev(V_.end()); V_.erase(*prev(V_.end())); return T_; }
mt19937 gen(time(NULL)); int rd() { return abs((int)gen()); }
int rnd(int l,int r) { return rd()%(r-l+1)+l; }
void main_init()
{

}
cint L=1.02e7,K=10;
cint z[]={1,10,100,1000,10000,100000,1000000,10000000,100000000,1000000000};
cint M=10;
int h[L];
LL n,n2;
LL d1[M],d2[M];
pair<LL,LL> work(LL x,LL m1,LL y,LL m2)
{
    // printf("begin:\n%lld,%lld %lld,%lld\n",x,m1,y,m2);
    LL g=gcd(m1,m2);
    if(x%g!=y%g||m1/g>n/m2) return {0ll,0ll};
    LL m=m1/g*m2;
    LL w1,w2; ex_gcd(w1,w2,m1/g,m2/g);
    // printf("%lld*%lld+%lld*%lld=%lld\n",w1,m1,w2,m2,w1*m1+w2*m2);
    LL t=(((in128)w1*m1)%m*((y-x)/g)+x)%m;
    if(t<0ll) t+=m;
    // printf("end\n");
    return {t,m};
}
LL dfs(int m,LL w1,LL w2)
{
    if(n2<w1) return 0ll;
    if(!m)
    {
        // printf("dfs %lld,%lld\n",w1,w2);
        return ((n2-w1)/w2)+(w1?1ll:0ll);
    }
    // printf("%lld,%lld\n",w1,w2);
    LL sum=0ll;
    sum+=dfs(m-1,w1,w2);
    auto [w1_,w2_]=work(w1,w2,d1[m],d2[m]);
    // printf("want %lld,%lld\n",w1_,w2_);
    if(w2_) sum-=dfs(m-1,w1_,w2_);
    return sum;
}
void main_solve()
{
    LL c;
    scanf("%lld%lld",&n,&c);
    For_(i,1,z[6]) h[i]=h[i/10]+1;
    LL ans=n/z[1]/c;
    For_(i,1,z[6])
    {
        stop(i>=n);
        int m=0;
        // #define watch 12
        // if(i==watch) printf("h[%d]=%d\n",i,h[i]);
        For(k,1,h[i])
        {
            LL w1=1ll*z[h[i]-k],w2=1ll*(i/z[k]),w3=1ll*(i%z[k])+c;
            // if(i==watch) printf("%lld,%lld,%lld\n",w1,w2,w3);
            w1%=w3,w2=md(-w2,w3);
            LL g=__gcd(w1,w3);
            exc(w2%g);
            w1/=g,w2/=g,w3/=g;
            m++;
            d1[m]=inv(w1,w3)*w2%w3,d2[m]=w3;
        }
        /*if(i==watch)
        {
            printf("i=%d\n",i);
            For(k,1,m) printf("> %lld,%lld\n",d1[k],d2[k]);
        }*/
        n2=(n-i)/z[h[i]];
        ans+=dfs(m-1,d1[m],d2[m]);
    }
    outll(ans);
}
int main()
{
    // ios::sync_with_stdio(0); cin.tie(0);
    // freopen("in.txt","r",stdin);
    // freopen("out1.txt","w",stdout);
    // srand(time(NULL));
    main_init();
    // int _; inint(_); For(__,1,_) // T>1 ?
        // printf("\n------------\n\n"),
        main_solve();
    return 0;
}
/*
26 39
*/