Can someone please help me with the snail problem from JavaScript?

Question

The snail moves 7 feet daily and slides 2 feet nightly. Given a variable depth of a well, log how many days would it take the snail to reach the top? I feel like I'm at least thinking of the problem correctly, but I'm pretty new to coding and am unsure of the formation. Any help would be appreciated. I don't need the answer, just maybe a bit of knowledge I'm missing to get there? Here's the code I have been working with. Thanks in advance!

function main() {
var depth = parseInt(readLine(), 10);
var day = 0
var distance = 0
while (distance < depth){
distance+7-2;
++day
}
console.log (day);
}

Answer 1

Yes.
distance+7-2 it calculates but without storing result , its no use .

break; statement can be used to break a loop..

Ex: on a condition:
while(..) {
//...
if ( condition )
break;
//..
}

Answer 2

store back result for distance..
distance = distance+7-2;
But you should not subtract 2 for the last time if distance+7 is reached depth..

Answer 3

Thank you for replying! Are you saying that my distance variable should be the distance equation you replied? Distance=distance+7-2
Is there a way to break from the loop in the middle of the equation if need be?

Answer 4

A side comment: instead of pasting the code, save it in Code Playground and link it in the question. Easier for debugging and helping.