import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class PockyGame {

	public static void main(String[] args) throws IOException {
		// TODO 自動生成されたメソッド・スタブ
		//長さ
		int length;
		//齧るスピード
		int speed;
		//入力値
		String[] input;
		
		//入力待ち
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		input = in.readLine().split(" ");
		length = Integer.parseInt(input[0]);
		speed = Integer.parseInt(input[1]);
		
		int counter = 0;
		while(true){
			//ハルカちゃん
			length = length - speed;
			//ユウちゃん
			if(length - speed > 0){
				length = length - speed;
				counter++;
			}else{
				break;
			}
		}
		
		System.out.println(speed * counter);

	}

}