#include <iostream>
#include <algorithm>
#include <vector>
#include <cassert>

using namespace std;

static const long long MOD = 1000000000LL;

long long gcd(long long x, long long y) {
	do {
		if (x < y) {
			std::swap(x, y);
		}
		x = x % y;
	} while (x > 0LL);
	return y;
}

int main() {
	long long n, m;
	cin >> n >> m;
	long long win = n / 1000 % m;
	long long lose = m - win;
	vector<long long> numerators;
	for (long long i = max(win, lose) + 1; i <= m; ++i) {
		numerators.push_back(i);
	}
	for (long long i = min(win, lose); i >= 2; --i) {
		long long denominator = i;
		for (size_t k = 0; k < numerators.size() && denominator > 1; ++k) {
			long long divisor = gcd(numerators[k], denominator);
			if (divisor > 1) {
				numerators[k] /= divisor;
				denominator /= divisor;
			}
		}
		assert(denominator == 1);
	}
	long long result = 1;
	for (size_t i = 0; i < numerators.size(); ++i) {
		result *= numerators[i];
		result %= MOD;
	}
	cout << result << endl;
	return 0;
}