Part A is produced on machine 1 and Part B is produced on machine 2. Defect rates for these machines are 3% and 5%, respectively. Three units of part A and two units of part B are assembled at assembly station 3 into the completed product. The defect rate at the assembly station 3 is 6% and for this assembly station. The weekly demand is 10000 units. If machine 2 operates five days per week, 10 hours per day with a standard time of 5 minutes, efficiency of 95%, and reliability of 90%, what is the required number of machines 2 to meet the weekly demand (round up to the nearest integer)?