About below describes, how can I write the code?

Question

The snail climbs up 7 feet each day and slips back 2 feet each night.
How many days will it take the snail to get out of a well with the given depth?

Sample Input:
31

Sample Output:
6

Explanation: Let's break down the distance the snail covers each day:
Day 1: 7-2=5
Day 2: 5+7-2=10
Day 3: 10+7-2=15
Day 4: 15+7-2=20
Day 5: 20+7-2=25
Day 6: 25+7=32
So, on Day 6 the snail will reach 32 feet and get out of the well at day, without slipping back that night.

Answer 1

Each day the snail climbs 7 feet, then slips back 2 feet at night — so it gains 5 feet per full day. But on the last day, it climbs out and doesn’t slip back.

So if the well depth is d, the formula is:

import math

def days_to_escape(depth):
if depth <= 7:
return 1
return math.ceil((depth - 7) / 5) + 1

# Example:
print(days_to_escape(31)) # Output:6