#144. Bus (20 seats)
n students go on a trip. One bus takes 20 people. What is the smallest number of buses they need?
### Input
One integer n (1 ≤ n ≤ 1000).
### Output
The number of buses.
Examples
Input
698
Output
35
Input
386
Output
20
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.