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
10^{8 } ≤ (a , b) ≤ 10^{8}
Example
Input:2 5
5 10
Output:14
45
hide comments
kshubham02:
20190419 18:21:06
@prachij


Kanish_The_Vista:
20181020 17:42:40
This should be moved to tutorial section


prachij:
20181019 15:42:55
How to make the "Input is terminated by (end of file)" in python3


phoemur:
20181017 03:34:59
This should be moved to tutorial... Last edit: 20181017 03:38:39 

dewa251202:
20181009 15:27:01
you are welcome :) 

erik_prasetio:
20181008 14:51:53
@dewa251202


dewa251202:
20181002 11:09:37
@erik_prasetio


chhavi96:
20180930 15:02:58
beware of a>b!!


dinesh_kumar23:
20180930 14:34:56
Take care of negative numbers.


erik_prasetio:
20180930 12:24:28
How to make the "Input is terminated by (end of file)", I'm new at programming

Added by:  Nabil 
Date:  20180926 
Time limit:  2s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All 