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

public class Main {

	public static void main(String[] args) {
	      BufferedReader stdReader =new BufferedReader(new InputStreamReader(System.in));
	      try {
	    	long n = Long.parseLong(stdReader.readLine());
	    	int m = Integer.parseInt(stdReader.readLine());
	    	System.out.println(n/(m*1000)*1000);
	      } catch (IOException e) {
			e.printStackTrace();
	      }
	}

}