Grand Digit Total
Print the sum of the digit sums of every integer from 1 to N.
Input: one integer N.
Output: ∑i=1..N digitsum(i).
Constraints:
- 1 ≤ N ≤ 1018
Sample Tests
Input 1
10
Output 1
46
Input 2
3
Output 2
6
Discussion (opens after you solve — no spoilers before)
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