The snail in the well

Question

I passed it somehow but i just want to know why this code doesnt pass some tests

function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
var y =0;
for(var x=0;x<=depth;x+=7){

if(x<depth){
x-=2
y++
}

}
console.log(y)
}

The output is higher than the expected output by one
For example in case 1 it should be 8 but the output is 9
I know its because it reduce x by 2 in the last night but it should not cause if you look when x is higher than depth it should not do the x-2 expression and should not do y++ either

Answer 1

First add 7 to x.
If it is not exceed depth then decrese by 2
else break.

Answer 2

Thanks so the problem was that at first x was decreased by 2 without adding to 7