The provider orders magnesium sulfate to treat a primigravida client's severe pre-eclampsia. The medication is available as 60 grams of magnesium sulfate in 1000 mL of Lactated Ringer's at a rate of 4 grams/hr. The medication is titrated every hour by 1 gram/hr. The infusion began at 0800, what is the rate of infusion at 1300. (Record numerical answers only. Round the answer to the nearest whole number.)