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Description

Using the formula $C=5×(F−32)÷9$ (where $C$ represents Celsius temperature and $F$ represents Fahrenheit temperature), convert the input Fahrenheit temperature $F$ to Celsius temperature $C$, with the result rounded to 5 decimal places.

Input Format

One line containing a real number $F$, representing the Fahrenheit temperature. ($F≥−459.67$)

Output Format

One line containing a real number, representing the corresponding Celsius temperature, rounded to 5 decimal places.

Sample

41

5.00000