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Competitions

Week 1: November 2 – 8. Introduction to C language. Part 1

Sum of integers on the interval

Find the sum of all integers from a to b.

Input

Two integers а and b, no more than 2 * 109 by absolute value.

Output

Print the sum of all integers from a to b.

Time limit 1 second
Memory limit 128 MiB
Input example #1
2 5
Output example #1
14