import java.util.*;
import java.io.*;

public class Test{
  public static void main(String[] args)throws Exception{
      BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
      int min=1000;
      int M=Integer.parseInt(br.readLine());
      int N=Integer.parseInt(br.readLine());
      int a=M/min;
      a/=N;
      a*=min;
      System.out.println(a);
  }
}