THE EXERCISE OF THE GUYS GUYS HAS BEEN MOVED TO THE MENU "EXERCISE OF Teacher"

Total number of 1 to the N

Threads: Enter an integer n. Refined total numbers from 1 to the N.
Input: An integer n.
Output: An integer is the sum of the number of words 1 to the N.

For example:

input:
3
output:
6

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