Value of variable 3#8827
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Value of variable 3

1 second
128 megabytes
Very easy

Find the value of the variable for a given real value of the variable .

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

Input

Value of the variable .

Output

Print the value of the variable up to thousandths.

Examples

Example 1

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