class Solution {
    int max = 0;
    public int maxGoodNumber(int[] nums) {
        int visited[] = new int[3];
        List<Integer> list = new ArrayList<>();
        find(nums,visited,list);
        return max;
    }
    public void find(int nums[], int visited[],List<Integer> list){
        //base case
        if(list.size()==3){
            //System.out.println(list);
            max = Math.max(max,Integer.parseInt(Integer.toBinaryString(list.get(0)) + Integer.toBinaryString(list.get(1)) + 
            Integer.toBinaryString(list.get(2)),2));
            return;
        }

        for(int i = 0;i<3;i++){
            if(visited[i]!=1){
                visited[i]  =1;
                list.add(nums[i]);
                find(nums,visited,list);
                visited[i] = 0;
                list.remove(list.size()-1);
            }
        }
    }
}