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

public class No128 {
		public static void main(String args[]){
			try{
				BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         		long budget = Long.parseLong(br.readLine());
         		int member = Integer.parseInt(br.readLine());
         		System.out.println((budget / (member*1000)) * 1000);
			}catch(Exception e){
				e.getStackTrace();
			}
	}
}