Что выведет код?

class counter:
    def __init__(self, func): 
        self.calls = 0
        self.func = func
        
    def __call__(self, *args): 
        self.calls += 1
        return self.func(*args), self.calls
    
@counter 
def square(a): 
    return a ** 2

print(square(2)[0] + square(3)[0] + square(4)[1])