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; } } } }