# 原始题目

## B - 105

• Time limit : 2sec / Memory limit : 1000MB

• Score: 200 points

### Problem Statement

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


Print the count.

105

### Sample Output 1

1

• Among the numbers between 1 and 105, the only number that is odd and has exactly eight divisors is 105.

### Sample Input 2

7


### Sample Output 2

0

• 1 has one divisor. 3, 5 and 7 are all prime and have two divisors. Thus, there is no number that satisfies the condition.

# 集体思路

• 水题，预处理一下因子个数，再求一下前缀和就行。