Compute array sum

Summary

Calculate the sum of all numeric elements in an array.

Problem statement

Given a list of numbers (integers), compute and return the sum of all elements. If the list is empty, return 0. Do not use built-in sum() — implement the accumulation manually to practice iteration and accumulation patterns.

Task

Write a function that returns the sum of elements in a list of numbers. Handle empty lists and negative values.

Examples

Input format

A single argument: a list of integers, e.g. [1, 2, 3]

Output format

An integer representing the sum of the list. For an empty list, return 0.

Constraints

The list length can be 0 to 10^6. Elements fit into Python int. Time complexity O(n).

Samples