DHRODD - Total Odd V1

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There are two integers L and R, you'll have to count how many odd numbers are there withing the range from L to R inclusive.
All of you know what is a odd number. 

There are two integers L and R, you'll have to count how many odd numbers are there withing the range from L to R inclusive.

All of you know what is a odd number. A number that is not divisible by 2 is called a number.

 

Input

The only line contain two integers L, R.

Constraints

1<=L<=R<=100000000

Output

Print the count of odd numbers from L to R inclusive.

Example

Input:
2 3
Output:
1

[ Original Setter of this Problem Dhruba Mitra, RUET ]



Added by:Avik Sarkar
Date:2018-05-30
Time limit:2s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All
Resource:RUET Beginner Battle -1