import java.util.*;

public class Main {
	
	public static final int[] PRIME = new int[]{3 * 5 * 7, 3 * 5 * 11, 3 * 5 * 13, 3 * 3 * 3 * 5, 3 * 3 * 3 * 7};
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int count = 0;
		for (int i = 0; i < PRIME.length; i++) {
			if (PRIME[i] <= n) {
				count++;
			}
		}
		
		System.out.println(count);
	}
}
/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