import java.util.Scanner;

public class sample128 {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
	int b = scan.nextInt();
        if(a <= 1000){
            System.out.println(a/b);
        }else if((a/b) >= 1000){
            int komakai = a / b;
            int kettei = komakai - (a/b)%1000;
            System.out.println(kettei);
        }
            
               
    }
}