A survey of 1,061 tourists visiting Orlando was taken. Of those surveyed: 253 tourists had visited the Magic Kingdom 258 tourists had visited LEGOLAND 253 tourists had visited Universal Studios 70 tourists had visited both the Magic Kingdom and LEGOLAND 75 tourists had visited both the Magic Kingdom and Universal Studios 91 tourists had visited both LEGOLAND and Universal Studios 39 tourists had visited all three theme parks How many tourists had not visited any of these three theme parks?