On January 1, 2016, Lego Construction Company signed a contract to build a custom garage for a customer and received $10,000 in advance for the job. The new garage will be built on the customers land. To complete this project, Lego must first build a concrete floor, construct wooden pillars and walls, and finally install a roof. Lego normally charges stand-alone prices of $3,000, $4,000, and $5,000, respectively, for each of these three smaller tasks if done separately.

How many performance obligations exist in this contract?