Recursion: Sum

Write a function that finds the sum of the first n natural numbers. Make your function recursive.

Examples

sum_numbers(5) ➞ 15
# 1 + 2 + 3 + 4 + 5 = 15

sum_numbers(1) ➞ 1

sum_numbers(12) ➞ 78

Notes

• Assume the input number is always positive.