Diego’s family car holds 14 gallons of fuel. Each day the car uses 0.5 gallons of fuel. A warning light comes on when the remaining fuel is 1.5 gallons or less. The car starts with a full tank and they will be gone for 60 days. Diego's dad completely refills the car whenever the warning light is going to come on. The car starts off full. What is the minimum number of times that they will have to refill the car during the trip.