eolymp
Competitions

Week 1 Introduction Part 1

Sum of integers on the interval

Time limit 1 second
Memory limit 128 MiB

Find the sum of all integers from a to b.

Input data

Two integers а and b, no more than 2 \cdot 10^9 by absolute value.

Output data

Print the sum of all integers from a to b.

Examples

Input example #1
2 5
Output example #1
14