Value of expression 2#8832
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Value of expression 2

1 second
128 megabytes
Very easy

Find the value of the expression for the given values of the variables and .

{x^2 - 2xy + 4y^2 \over x + 5} + {3x^2 - y^2 \over y - 7}

Input

Values of the variables and .

Output

Print the value of the expression up to thousandths.

Examples

Example 1

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