package m.shin;
import java.util.Scanner;
public class Con128 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		long N = s.nextLong();
		int M = s.nextInt();
		s.close();

		int max = 0;
		for(int i = 1;;i++){
			if(i * M * 1000 <= N){
				max++;
			}else{
				break;
			}
		}
		System.out.println(max * 1000);

	}

}