# Number of odd numbers in the interval

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 64 megabytes

Determine and output the count of odd integers within the interval [a, b].

## Input

Two integers, a and b, separated by a space, each not exceeding `10^18`

.

## Output

The solution to the problem.

## Examples

Input #1

Answer #1

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