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        public static int getTotalX(List<Integer> a, List<Integer> b) {
            int count = 0;
            for (int num = a.get(0); num <= b.get(0); num += a.get(0)) {
                boolean flag = true;
                for (int i = 0; i < a.size(); i++) {
                    if (num % a.get(i) != 0) {
                        flag = false; 
                        break;
                    }
                }
                for (int i = 0; i < b.size(); i++) {
                    if (b.get(i) % num != 0) {
                        flag = false;
                        break;
                    }
                }
                if (flag) {
                    count++;
                }
            }
            return count;
        }