A lot of pets

I surveyed my entire high school class to see if they had pets. 100 had no pets, 200 had a dog, 300 had a cat, 400 had a fish, 30 had a fish and a cat, 40 had a dog and a fish, 35 had a dog and a cat, and 25 had a dog, a fish and a cat. How many students were in my high school class?

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