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

public class Tester2 {
	public static void main(String[] args){
		try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))){
			long num = Long.parseLong(br.readLine());
			long m = Long.parseLong(br.readLine());
			System.out.println(method(num,m));
		}catch(IOException e) {
			e.printStackTrace();
		}
	}
	static int method(long num,long m) {
		int n = (int)(num/(m*1000));
		if(n != 0)return n*1000;
		return 0;
	}
}