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#include <iostream>

using namespace std;

unsigned long long suma(int i)
{
    int tmp,suma=0;
    for(;i>0;)
    {
        suma=suma + (i%10)*(i%10);
        i=i/10;

    }
    return suma;
}
int main()
{
    unsigned long long k,a,b,licznik=0;
    cin >> k >> a >> b;
    for(unsigned long long i=a;i<=b;i++)
    {

        if(suma(i)*k==i)
            licznik++;

    }
    cout<<licznik;
    return 0;
}