The group project starts and the team leader is gone

Sungwoo is in the first semester of his third year, taking a course called 'Counting the hind leg hairs of the red-eyed fruit fly, and understanding pineapple skin'. With the final exam coming up, the professor handed the class a group assignment.

Using the method for counting the hind leg hairs of a red-eyed fruit fly that you learned before the midterm, derive a formula for the thickness of pineapple skin. Submit it with scientific evidence, on at least 10 sheets of A4 paper. [30%]

Mingeon, the leader of Sungwoo's group, ran home the moment he heard what the assignment was, so Sungwoo sets out to find him. Every minute Sungwoo covers a distance of at least 1 and at most 5. Given the distance from where Sungwoo stands to Mingeon's house, write a program that prints exactly how many minutes it takes Sungwoo to find Mingeon when he goes as fast as he can.

The first line contains the distance $L$ from Sungwoo's current position to Mingeon's house. ($1 \le L \le 1{,}000{,}000$)

If the shortest time in which Sungwoo can find Mingeon is $t$ minutes, print the smallest integer that is at least $t$, on one line.