The number of even numbers between the numbers
Easy
Execution time limit is 1 second
Runtime memory usage limit is 64 megabytes
Determine and print the number of even integers that exist between the integers a and b.
Input
Two integers, separated by a space, each not exceeding 10^18.
Output
The solution to the problem.
Examples
Input #1
Answer #1
Input #2
Answer #2
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