Sum of Remainders
Print ∑i=1..M (N mod i).
Input: one line with two integers N and M.
Output: the sum of remainders.
Constraints:
- 1 ≤ M ≤ N ≤ 1012
Sample Tests
Input 1
7 5
Output 1
7
Input 2
10 10
Output 2
13
Discussion (opens after you solve — no spoilers before)
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