Calories in this Chicken Gyro and Mango Pineapple Salad?

Ordered this for lunch. They had it listed as 430 cals for the gyro (chicken and veggies on a flatbread), 50 cals for the tzatziki sauce, and 150 for a serving of the mango pineapple salad (I got 2 servings). Is 800 calories too low for this meal? In my mind it is…