Problem
You are given two integers A and B. Print the sum of all integers from A to B (inclusive), assuming A ≤ B.
Input format
Input
input.txt
- Two space-separated integers A and B
Output format
Output
output.txt
- One integer: the sum from A to B
Example
input
2 4
output
9
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Sample cases (from the problem)
Sample Case 1
Input
2 4
Expected output
9
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