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Problems

Previous even integer

Previous even integer

Integer n is given. Print the previous even number for n.

Input

One integer n.

Output

Print the even number before n.

Time limit 1 second
Memory limit 128 MiB
Input example #1 
7
Output example #1 
6
Input example #2 
6
Output example #2 
4
Author Matviychuk Sergiy Volodymyrovych
Source "ABC programming"
Previous odd integer
Next odd integer