The Odd Side of the Street

Easy

A mail carrier visits the houses numbered from first to last, inclusive. Odd-numbered houses stand on one side of the street and even-numbered ones on the other. How many of these houses are on the odd side? Return that count.

Example 1

first=4, last=11 → 4

The odd numbers are 5, 7, 9 and 11, so four houses.

Example 2

first=6, last=6 → 0

The only house, number 6, is on the even side.

Example 3

first=0, last=3 → 2

Numbers 1 and 3 qualify.

Constraints

0 ≤ first ≤ last ≤ 2·10⁹

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Topics

Math

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Input

first=4, last=11

Expected

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