import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		//int b = scan.nextInt();
		int cnt = 0;
		/*N以下の自然数
		奇数である
		約数が8個ちょうど存在する*/
		for( int i = 1; i <= N; i += 2 ) {
			int yakusuu = 0;
			for( int j = 1; j <= i; j++  ) {
				if( i % j == 0 ) {
					yakusuu++;
				}
			}
			if( yakusuu == 8 ) {
				cnt++;
			}
		}
		System.out.println(cnt);
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz