Package for this problem was not updated by the problem writer or Codeforces administration after we’ve upgraded the judging servers. To adjust the time limit constraint, solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then value 800 ms will be displayed and used to determine the verdict.

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

The problem statement has recently been changed. View the changes.

×
A. Almost Prime

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputA number is called almost prime if it has exactly two distinct prime divisors. For example, numbers 6, 18, 24 are almost prime, while 4, 8, 9, 42 are not. Find the amount of almost prime numbers which are between 1 and *n*, inclusive.

Input

Input contains one integer number *n* (1 ≤ *n* ≤ 3000).

Output

Output the amount of almost prime numbers between 1 and *n*, inclusive.

Examples

Input

10

Output

2

Input

21

Output

8

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Nov/25/2020 11:17:29 (f3).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|