A factory produces a certain product, and the production process involves four consecutive stages. The probability that the product will be defective at the first stage is 0.2, at the second stage is 0.1, at the third stage is 0.05, and at the fourth stage is 0.02. If a product is defective, it will be rejected and will not proceed to the next stage. What is the probability that a product will pass all four stages without being rejected?