Snail in the well javascript

Question

Hello, can someone help me evaluate my code for this js question, i keep getting just the first case wrong
function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
var day=0;
var climb=7;
var slip=2;
for(dis=0;dis<=depth;){
dis=dis+climb;
if(dis<=depth){
dis=dis-slip;
day++;
}
else{
day++;
break;
}
}
console.log(day);
}

Answer 1

When the snail climbs in the first day should be one not zero, imagine you got a new job, will the first day of the job start from zero (first day: means day one)?

Answer 2

If i set the day as one then the all the cases go wrong...
Secondly the distance covered at day 0 is 0 day 1 is 5 day 2 is 10 and so on.

Answer 3

For me this worked:

function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
var dayssum=1
for (x=7; x<depth; x+=7) {
if(x>=depth) break;
else x-=2
dayssum++}
console.log(dayssum)
}