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#include <iostream>

using namespace std;

long f(long x)
{
    long temp=0;
    while(x>1)
    {
        int a=x%10;
        x=x/10;
        temp+=a*a;
    }
    return temp;
}

int main()
{
    long k,a,b;
    cin>>k>>a>>b;
    int n=0;
    for (long i=a;i<b;i++)
    {
        if(i%k==0)
        {
            if(i==f(i)*k)
            {
            n++;
            }

        }
    }
    cout<<n;

    return 0;
}