PRADIPSUM - Easy Math

Zoro is a student of a primary school. He likes to solve mathematical problem. One day he tries to solve a math, but he is unable to solve the problem efficiently because of being a student of primary school. As you are a programmer he wants your help to solve this problem. The problem is to find the sum of some consecutive numbers.

Example, if the first number is 2 and the last number is 5, then the result would be

2 + 3 + 4 + 5 = 14

Input

Every line contains two integers a and b. Input is terminated by the end of file.

Output

Output the sum the of all numbers between a and b (inclusively).

Constraints

-108  ≤ (a , b) ≤ 108

Example

Input:
2 5
5 10

Output:
14
45

Added by:Nabil
Date:2018-09-26
Time limit:2s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All

hide comments
2018-10-08 14:51:53
@dewa251202
thanks lemme try that.

edit: oh thanks alot learned something new at programming

Last edit: 2018-10-08 15:02:52
2018-10-02 11:09:37
@erik_prasetio
the easiest way is

while(cin >> a >> b)
2018-09-30 15:02:58
beware of a>b!!
costed me 4 WA
2018-09-30 14:34:56
Take care of negative numbers.
And use, while(scanf("%lld%lld" ,&a, &b) != EOF) for input
2018-09-30 12:24:28
How to make the "Input is terminated by (end of file)", I'm new at programming
2018-09-30 04:27:21
What's wrong with my first submission? :(


Edit : Nevermind, i didn't read the problem carefully

Last edit: 2018-09-30 04:29:34
2018-09-29 16:58:41
Watch out for stupid a > b testcases.
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