import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashSet;

public class Main {
    public static void main(String[] args) {
        Main main = new Main();
        main.solve(args);
    }

    public void solve(String[] args) {
        MyScanner scanner = new MyScanner();
        int a = scanner.nextInt();
        int count = 0;
        int tmp;
        int tmp2;
        int elemCount;
        HashSet<Integer> b = new HashSet<Integer>();
        if (a<105) {
        	System.out.println(count);
        }else {
        	for (int i=105;i<=a;i++) {
        		if(i%2 != 0) {
        			b=new HashSet<Integer>();
        			elemCount = 0;
        			tmp = 3;
        			tmp2 = i;
        			while(tmp2 != 1) {
        			    if(tmp2%tmp == 0) {
        			          b.add(tmp);
        			          elemCount++;
        			          tmp2 /= tmp;
        			    }
        			    else {
        			    	tmp+=2;
        			    }
        			}
        			if((b.size()==3&&elemCount==3)||(b.size()==2&&elemCount==4)) {
        				count++;
        			}

        		}
        	}
        	System.out.println(count);
        }

        //int[] sosuu = {3 ,5 ,7 ,11 ,13};
        /*
         * 3,5,7   = 105 # 3,5,7,15,21,35
         * 3,3,3,5 = 135 # 3,5,9,15,27,45
         * 3,3,5,5 = 225 X
         * 3,5,11  = 165 # 3,5,11,15,33,55
         * 3,3,3,7 = 175
         * 3,5,13  = 195 # 3,5,13,15,39,65
         * 5,7,11  = 385 X
         */
        /*
        if (a < 105) {
        	System.out.println(0);
        }else if(a < 135) {
        	System.out.println(1);
        }else if(a < 165) {
        	System.out.println(2);
        }else if(a < 175) {
        	System.out.println(3);
        }else if(a < 195) {
        	System.out.println(4);
        }else {
        	System.out.println(5);
        }
        */

    }

    private class MyScanner {
        String[] s;
        int i;
        BufferedReader br;
        String reg = " ";
        MyScanner () {
            s = new String[0];
            i = 0;
            br = new BufferedReader(new InputStreamReader(System.in));
        }
        public String next() {
            try {
                if (i < s.length) return s[i++];
                String line = br.readLine();
                while (line.equals("")) {line = br.readLine();}
                s = line.split(reg, 0);
                i = 0;return s[i++];
            } catch (Exception e) {e.printStackTrace();}
            return null;
        }
        public int nextInt() {
            try {return Integer.parseInt(next());} catch (Exception e) {e.printStackTrace();}
            return -1;
        }
        public double nextDouble() {
            try {return Double.parseDouble(next());} catch (Exception e) {e.printStackTrace();}
            return -1;
        }
        public long nextLong()  {
            try {return Long.parseLong(next());} catch (Exception e) {e.printStackTrace();}
            return -1;
        }
    }
}
/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