题目描述
The number 105 is quite special - it is odd but still it has eight divisors. Now, your task is this: how many odd numbers with exactly eight positive divisors are there between 1 and N (inclusive)?
Constraints
- N is an integer between 1 and 200 (inclusive).
Input
Input is given from Standard Input in the following format:
N
Output
Print the count.
Examples
Input
105
Output
1
Input
7
Output
0
输入格式
见题面
输出格式
见题面
样例输入
105
样例输出
1