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#include <cstdio>
#include <algorithm>

using namespace std;

int main()
{
    long long k,n,a,b,c,d,e,w=0;

    scanf ("%lld%lld%lld", &k, &a, &b);

    for (c=k; c<=b && c<=k*1500; c+=k)
    {
        if (c<a)
            continue;

        e=0;

        for (d=c; d; d/=10)
            e+=(d%10)*(d%10);

        if (c==e*k)
            w++;
    }

    printf ("%lld", w);

    return 0;
}