import java.math.BigDecimal;
import java.math.MathContext;
import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a[] = new int[]{105,135,165,189,195};
        int n = scanner.nextInt();
        int k = 0;
        for (int b:a){
            if(b <= n)++k;
        }
        System.out.println(k);
    }

}

/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