How can i program this ? In Java script

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.
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Answer 1

You tagged some post what dont talk about this question, you could just look for this question and find answer insted.

Here is some:

https://www.sololearn.com/discuss/2665192/?ref=app
https://www.sololearn.com/discuss/2768638/?ref=app
https://www.sololearn.com/discuss/2618113/?ref=app
https://www.sololearn.com/discuss/2624694/?ref=app

Answer 2

Tnx