Moving House

I'd like to calculate how long on average I've lived in the same house.

Given a person's age and the number of times they've moved house as moves, return the average number of years that they've spent living in the same house.

Examples

years_in_one_house(30, 1) ➞ 15

years_in_one_house(15, 2) ➞ 5

years_in_one_house(80, 0) ➞ 80

Notes

• You can assume that the tests include people who've always lived in a house.
• Round to the nearest year.