public static long getSum(List<Long> list, int level, int start, int end){
        //System.out.println("Start: "+start+"End: "+end);
        if(start>end)
            return 0;
        if(start==end){
            if(level%2==0){
                return list.get(start);
            }
        }

        int ind = 0;
        for(int i=start+1;i<list.size();i++){
            if(list.get(i)>=list.get(start)){
                ind = i;
                break;
            }
        }
        return getSum(list,level+1,start+1,ind-1)+getSum(list,level+1,ind,end);
    }
}