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#include <iostream>
using namespace std;
int suma(int y)
{
    int suma=0;
    while(y!=0)
    {
        suma+=(y%10)*(y%10);
        y/=10;
    }
    return suma;
}
int main()
{
    long long int a, b, k;
    int x=0;
    cin>>k>>a>>b;
    for(a; a<=b; a++)
    {
        if(k*suma(a)==a)
            x++;
    }
    cout<<x;
    return 0;
}