最大公约数 && 最小公倍数

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int A = sc.nextInt();
            int B = sc.nextInt();
            System.out.println(A * B / gcd(A, B));
        }
    }

    private static int gcd(int a, int b) {
        return b == 0 ? a : gcd(b, a % b);
    }
}