Don't do that. When people on total have fewer than 4 packs a day their weight loss actually slows down. Also, you need 4 packs (or 4 packs plus a meal). In addition, you need at least 50 g of protein a day otherwise you are likely to get muscle wastage.
You do however have a couple of options...
1. Use something like My Fitness Pal to keep track of what you eat. The LL packs are in there so that bit is easy. If you keep below 800 calories and 60g of carbs you will be in ketosis and losing weight quickly. I have moved from total to lite and this is what I do.
2. Buy some equivalent packs from elsewhere - such as Slim and Save. Then have the fourth pack as a Slim and Save one. You can buy their packs online. However, this is not ideal as your LLC will think that you are eating food which could lead to difficulties during counselling or when doing Route to maintenance.