Can anyone tell me Why this doesn't work for the snail in the well task?

Question

https://code.sololearn.com/cs2Ud5hpFdLw/?ref=app

Answer 1

function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
let distance = 0;
let days = 0;
do {
distance += 7;
days++;
if(distance >= depth){
break;
}
distance -= 2;
}
while(distance < depth );

console.log(days);

}

Answer 2

A simple one line of code should solve the problem:

Console.log(Math.round(depth / 5);