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//Daniel Grzegorzewski
#include <bits/stdc++.h>

#define MP make_pair
#define PB push_back
#define ST first
#define ND second
#define int long long

using namespace std;

typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VII;
typedef long long LL;

void init_ios()
{
     ios_base::sync_with_stdio(0);
     cin.tie(0);
}

int k, a, b, res;

int f(int x)
{
	int res = 0;
	while (x) {
		int co = x%10;
		res += co*co;
		x /= 10;
	}
	return res;
}

#undef int
int main()
{
#define int long long
    init_ios();
    cin >> k >> a >> b;
    for (int i = 1; i*k <= b && i <= 1500; ++i)
    	if (f(i*k) == i && i*k >= a)
    		++res;
    cout<<res<<"\n";
}