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//

#include <iostream>

using namespace std;

int kwadraty(int i)
{
    int pom = 1;
    int suma = 0;
    while(i/pom) pom *= 10;

    pom /= 10;
    while(i)
    {
        suma += (i/pom)*(i/pom);
        i = i - (i/pom)*pom;
        pom /= 10;
    }
    return suma;
}


int main()
{
    int a, b, k, wyn = 0;
    cin >> k >> a >> b;

    for(int i = a; i <= b; i++)
    {
        if(k*kwadraty(i) == i)
        {
            wyn++;
        }
    }
    cout << wyn << endl;
}