why you have those "f" there?
Like

printf, scanf

I dont know anything about C but I do know a little C++.

It seems that from reading your code that any number you enter would be valid for anything higher (i.e if you enter "75" it is less than 100 but it is also less than 500 and 1000. So you might want to make it (note i dont know this language im just going to write this in c++ it could be the same):
else if(followers < 100 && > 50) {printf ..... etc}

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