A research company desires to know the mean consumption of milk per week among males over age 40. They believe that the milk consumption has a mean of 3 liters, and want to construct a 85% confidence interval with a maximum error of 0.07 liters. Assuming a standard deviation of 1.3 liters, what is the minimum number of males over age 40 they must include in their sample? Round your answer up to the next integer.