MADODDSUM - Easy Odd Sum


Hablu likes odd numbers a lot. So he wants the sum of all odd numbers in range [a, b]. That is, find the sum of all odd numbers i such that (a ≤ i ≤ b). Seems easy right? Because it is.

Input

The first and only line will contain 2 integers a, b where (0 ≤ a ≤ 108) and (0 ≤ b ≤ 108).

Output

In one line, output the value of the sum

Example

Input:
0 9

Output:
25

hide comments
namanruhela03: 2017-12-14 16:07:54

It seems like an easy one but I can't get it right. I either get compilation error or wrong answer. Can someone help with where I can look for help?

shubham9261: 2017-07-30 22:52:38

just a minor mistake
cost me 2 wa's

Last edit: 2017-07-30 22:56:23
trollkarlnet: 2017-04-19 07:27:16

unsigned long long was my solution :|

trollkarlnet: 2017-04-19 01:48:47

I'm curious how the heck I'm getting a "wrong" answer on this, would be nice to see feedback on a case that is wrong! :( ... even using unsigned long for the sum preventing overflow :( ... This should be so simple :(

sahilkumar123: 2017-02-21 13:14:18

Don't look at Spoj toolkit ans , the range is [a,b]

sonudoo: 2017-02-17 11:24:07

Range given is wrong. Cost me 2 WAs. It must be (a,b]

kass_97: 2017-01-12 11:52:31

Range of i given incorrect....use spoj toolkit to check the output of your program and you'll get to know, cost me 1 WA

piccadimn: 2016-07-20 13:32:18

very simple ..

goelnandan: 2016-07-03 08:20:25

very easy ac in 1 go..!!
focus on boundary..!!

akshayjhamb2: 2016-06-18 14:59:18

i am getting compilation error or wrong answer. can someone help me ?


Added by:Ruhan Habib
Date:2015-11-05
Time limit:0.5s-1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64 GOSU JS-MONKEY
Resource:Me?