import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scan = new Scanner(System.in); long budget = scan.nextLong(); int numOfKids = scan.nextInt(); long handselAmount = 0; if(budget / numOfKids < 1000){ handselAmount = 0; }else if(budget % numOfKids == 0){ handselAmount = budget / numOfKids; }else{ int handselAmountBase = 1000; while(handselAmount * numOfKids < budget){ handselAmount += handselAmountBase; } handselAmount -= 1000; } System.out.println(handselAmount); scan.close(); } }