package yukicoder;

import java.util.Scanner;

public class Yuki63 {
	
	public static void main(String[] args) {
		
		Scanner scan = new Scanner(System.in);
		int L = scan.nextInt();
		int K = scan.nextInt();
		scan.close();
		
		int haru = 0;
		int yuki = 0;
		int count = 0;
		
		Boolean flg = true;
		while(flg){
			haru += K;
			yuki += K;
			
			if( L <= haru + yuki ){
				break;
			}
			count++;	
		}
		System.out.println(K*count);
	}
}