Practice · 1 of 6
Digit Sum
CHALLENGE
Difficulty: beginner+25 XP
**Description:** Given a positive integer n, print the sum of its digits.
**Input:** One integer n (1 ≤ n ≤ 10^18).
**Output:** One integer — the digit sum.
**Example:** 1234 → 1+2+3+4 = 10.
Press Submit to check your solution.
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