Perform named entity recognition on the given sentence below:
sentence:NAME_1 was the 44th President of the United States.
In this sentence, "NAME_1" is a person name entity, and "United States" is a geopolitical entity.

sentence:I just bought a new MacBook Pro from Apple.
In this sentence, "Apple" is an organization name entity, and "MacBook Pro" is a product name entity.

sentence:The Eiffel Tower is a famous landmark in Paris, France.
In this sentence, "Eiffel Tower" is a landmark name entity, and "Paris" and "France" are geopolitical entities.

sentence:Harvard University is one of the most prestigious schools in the world.
In this sentence, "Harvard University" is an organization name entity.

sentence: The population of Tokyo is over 13 million people.
In this sentence, "Tokyo" is a geographic entity, and "13 million" is a numerical entity representing the population of Tokyo.

sentence: I'm reading 'To Kill a Mockingbird' by NAME_2.