Why the output is showing 9 (input: 42).. ???? It should be 8...

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?
*/

function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
var climbUp=0;
var count=0;
for( ;climbUp<depth ;climbUp+=7)
{if(climbUp >= depth){count++;}
else{climbUp -=2;
count++;}
}

console.log(count);
}
/* Sample input : 42
Sample output : 8
*/

Answer 1

It might be the way you have your loop.
1st iteration:
ClimbUp (0) is less than depth, so it does the else statement > ClimbUp = -2
Count = 1.

Answer 2

Got it.thanks..
Correction:
{var count=1;
var climbUp=7;}