# Snail In the Well

Can some explain this code to me it's a bit confusing :/ function main() { var depth = parseInt(readLine(), 10); //your code goes here i = 0; for (; depth > 0;) { i++; depth -= 7 if (depth > 0) { depth += 2 } } console.log(i); } 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? Sample Input: 31 Sample Output: 6 Explanation: Let's break down the distance the snail covers each day: Day 1: 7-2=5 Day 2: 5+7-2=10 Day 3: 10+7-2=15 Day 4: 15+7-2=20 Day 5: 20+7-2=25 Day 6: 25+7=32 So, on Day 6 the snail will reach 32 feet and get out of the well at day, without slipping back that night. Hint: You can use a loop to calculate the distance the snail covers each day, and break the loop when it reaches the desired distance.