#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset


using namespace std;

int main() {

	long long int N, M;
	cin >> N >> M;

	long long int a = N / M;

	if (a % 1000 != 0) {
		a = a - (a % 1000);
	}

	cout << a << endl;

	return 0;

}