Joe Birra needs to purchase malt for his microbrewery production. His supplier charges $25 per delivery (no matter how much is delivered) and $1.25 per gallon, Joe's annual holding cost per unit is 25 percent of the price per gallon. Joe uses 520 gallons of malt per week. Assuming there are 52 weeks per year. How many gallons should Joe order from his supplier with each order to minimize the sum of the ordering and holding costs? (round to the nearest integer)