Mr. Ellis returns from the Post Anesthesia Care Unit (PACU) after his surgical procedure. He has an IV of LR infusing at 125 mL/hr, O2 at 2 L/min per nasal cannula, and an indwelling catheter attached to a drainage bag. Four hours later, the nurse documents Mr. Ellis' intake/output. The LR solution has been running for 4 hours, and the nurse administers and IV antibiotic that runs in 150 mL of normal saline. Mr. Ellis is still NPO after the procedure. How does the nurse document Mr. Ellis' intake in mL? (Enter numerical value only. If rounding is necessary, round to the whole number?)