import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int n = stdIn.nextInt();

		System.out.println(cnt(n));

		stdIn.close();
	}

	private static int cnt(int n) {
		if(n >= 195) {
			return 5;
		}
		if(n >= 189) {
			return 4;
		}
		if(n >= 165) {
			return 3;
		}
		if(n >= 135) {
			return 2;
		}
		if(n >= 105) {
			return 1;
		}
		return 0;
	}
}

/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