Value of variable 2#8826
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Value of variable 2

1 second
128 megabytes
Very easy

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

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

Input

Value of the variable .

Output

Print the value of the variable up to thousandths.

Examples

Example 1

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