Sum 1 to N

EASYLoops

Read a positive integer N. Output the sum of all integers from 1 to N (inclusive).

Input: A positive integer N. Output: The sum 1 + 2 + 3 + … + N.

Example:

Input:  5
Output: 15

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Sample Test Cases

Test 1: Sum 1–5

Inputs: 5

Expected: 15

Test 2: Sum 1–10

Inputs: 10

Expected: 55

Test 3: N = 1

Inputs: 1

Expected: 1

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