Up, Up, and Away is a producer of kites and wind socks. Relevant data on the bottleneck operation in the shop for the upcoming fiscal year are given in the following table: ?. i The shop works two shifts per day, 8 hours per shift, 190 days per year. Currently, the company operates four machines, and desires a 25 percent capacity cushion. How many machines should be purchased to me the upcoming year's demand without resorting to any short-term capacity solutions? The number of additional machines required is . (Enter your response rounded up to the next whole number.)