An 18-year-old client is pregnant for the first time. A few weeks before her due date, the client informs the nurse midwife that she has decided to breastfeed her baby after birth. As a part of the teaching plan, the nurse midwife informs the client that she need to needs to add some calories to her current RDA to ensure sufficient milk production. If the pre-pregnancy RDA of the client is 2,200 calories per day and her pregnancy RDA is 2,500 calories per day, the client’s RDA during the lactation period is: