import java.util.*;

public class Main {
	public static void main(String[] args) {

		int o,p,q;
		long a = 0, b = 0,c=0;
		
		Scanner sc  = new Scanner(System.in);
//		int[] test  = new int[100000];
	//  String str1 = sc.next();
	    long s = Long.parseLong(sc.next());
	    long t = Long.parseLong(sc.next());
	    
	    a = s / ( t * 1000 ) * 1000;
	    
	    System.out.println(a);
        System.out.println();
	}
}