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  2. 2 Additional Online Test (If Required)
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Problems > Grand Digit Total

Grand Digit Total

Difficulty: 1500 2000 ms 128 MB

math

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

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