Mary is in charge of quality control for a construction company. They order batteries for power tools in very large batches. Mary randomly samples 500 of the batteries in a batch to see if they are faulty. Based on the number of faulty batteries Mary calculates a 99% upper confidence bound for the proportion of faulty batteries. If the proportion of faulty batteries could be 0.06 (6%) or higher with 99% confidence, she rejects the batch. What is the highest number of faulty batteries Mary could find that will not result in the batch being rejected?