import java.util.*;

class Yuki128{
	public static void main(String[] args){
		Scanner stdIn = new Scanner(System.in);
		long n = stdIn.nextLong();
		long m = stdIn.nextLong();

		double a = n/m;
		long answer = (long)a/1000;
		System.out.println(answer*1000);
	}
}