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#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
long long int suma(long long int n)
{
 int wyn=0;
    while(n>9)
    {
        wyn+=(n%10)*(n%10);
        n=n/10;
    }
    return wyn+(n*n);

}
int main()
{
    ios_base::sync_with_stdio(0);
    long long int k;
    long long int l;
    long long int a;
    long long int b;
    cin>>k>>a>>b;
    l=k;
    double wynik=0;
    while(a%k!=0)
    {
       a++;
    }
    
    for(long long int i=a;i<=b;i+=k)
    {
       long long int q=suma(i);
       
       if(k*q==i)
       {
       	
         wynik++;
        }
    }
cout<<wynik<<endl;

// system("pause");
 return 0;

}