Individual demand and consumer surplus

Consider the market for hyperbaric chambers. The market price of each hyperbaric chamber is $$320,000,$ and each consumer demands no more than one hyperbaric chamber.

Suppose that Kevin is the only consumer in the hyperbaric chamber market. Their willingness to pay for a hyperbaric chamber is $$560,000.$ Based on Kevin's willingness to pay, the following graph shows his demand curve for hyperbaric chambers.

Shade the area representing Kevin's consumer surplus using the green rectangle $($triangle symbols$).$