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#include <iostream>

using namespace std;

typedef long long ll;

ll start(ll a, ll k)
{
    if (a % k == 0) return a;
    else return a + (k - a % k);
}

ll f(ll x)
{
    ll s = 0;
    while (x != 0)
    {
        s += (x % 10) * (x % 10);
        x /= 10;
    }
    return s;
}

int main()
{
    ios_base::sync_with_stdio(0);
    ll k, a, b;
    cin >> k >> a >> b;
    int il = 0;
    for (int n = start(a, k); n < b; n += k) if (k * f(n) == n) ++il;
    cout << il;
    return 0;
}