John is going to buy a suit with a probability of 0.5, buy pants with a probability of 0.3 and buy shoes with a probability of 0.4. The probability that he buys both a suit and pants is 0.11. The probability that he buys both a suit and shoes is 0.2 and the probability that he buys both pants and shoes is 0.17. The probability that he buys all the items is 0.04. What is the probability that he buys only one item?