Cutting at 512506392, gives a total enjoyment difference of 
1151013947.299806 which is smaller than the official answer.
and another question is why the answer should be in the y/z form?
The answer involves solving the roots of the quadratic equation (the root 
gives zero enjoyment difference), which inevitably leads to SQRT(), thus in 
some cases, the answer can not be expressed in the form of y/z  

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