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#include <iostream>

using namespace std;

unsigned long long potyczkowa (unsigned long long a, unsigned long long b)
{
    ios_base::sync_with_stdio(0);
    long long c=0;
    while (b!=0)
    {
    if (b%10==0)
    {
    c++;
    break;
    } else
    if(b!=1)
    {
    if(a%(b%10)!=0)
    {
    c++;
    break;
    }
    }
    b=b/10;
    }
    return c;
}

int main()
{
    ios_base::sync_with_stdio(0);
    unsigned long long r, l, d=0;
    cin>>r>>l;
    while(r<l)
    {
    if(potyczkowa(r, r)==0) d++;
    r++;
    }
    cout<<d;
    return 0;
}