Problem Description

We know that computer storage size units include B, KB, MB, etc. Now please write a calculator to convert between storage size units.

Note that $1$ GB = $2^{10}$ MB = $2^{20}$ KB = $2^{30}$ B.

Input Format

Input a string consisting of: an integer between 0 and 1023, a unit name (uppercase letters), an equals sign and a question mark, and a second unit name.

The unit can only be one of GB, MB, KB, B.

Output Format

Output a number, accurate to 6 digits after the decimal point.

128MB=?GB

0.125000

64MB=?KB

65536.000000

Hint

Translated by ChatGPT 5