import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String args[]) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String line = br.readLine();
		long money = Long.parseLong(line);
		line = br.readLine();
		int children = Integer.parseInt(line);
		
		System.out.println(money / children / 1000 * 1000);
	}
}