#include <iostream>
using namespace std;
typedef long long LL;
int main()
{
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	LL n;
	int m;
	cin >> n >> m;
	
	if(n <= 1000){
		cout << 0 << endl;
		return 0;
	}
	
	for(LL i = 0; i != n; i += 1000){
		if((n - i) % m == 0){
			cout << (n - i) / m << endl;
			return 0;
		}
	}
	
	return 0;
}