import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        int c = in.nextInt();
        for (int i = a; i < b; i++) {
            if (i % c == 0) {
                System.out.println(i);
                break;
            }
        }
    }
}