What is the Mistake in the code? It satisfy only 3 test cases only

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.
Hint: You can use a loop to calculate the distance the snail covers each day, and break the loop when it reaches the desired distance.
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function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
var claim_distance=7;
var slip_distance=2;
var distance_covered=0;
for(day=1;day<=depth/5;day++)
{
if(distance_covered >= depth)
{
break;
}
else
{
distance_covered += claim_distance - slip_distance ;
}
}
console.log(day);

}

Answer 1

You over-simplified the problem by dividing 5.

The snail moves in this sequence

Day 1
0 + 7 = 7
if not out, 7 - 2 = 5

Day 2
5 + 7 = 12
if not out, 12 - 2 = 10

See? The checking should be done immediately after +7 phase of each day.