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//Mateusz Pabian
#include <iostream>

using namespace std;
long long x,a,b,k,tmp,wynik=0;

int main()
{
    ios_base::sync_with_stdio(0);
    cin >>k>>a>>b;
    for (long long i=a;i<=b;i++)
    {
        tmp=0;
        x=i;
        while(x)
        {
            tmp+=(x%10)*(x%10);
            x=x/10;
        }
        if (tmp*k==i) wynik++;        
    }
    cout <<wynik<<endl;
    return 0;
}