import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        if (n == 1) {
            System.out.println(0);
            return;
        }
        boolean[] isNotPrimes = new boolean[n + 1];
        HashSet<Integer> squares = new HashSet<>();
        int ans = 0;
        for (int i = 2; i <= n; i++) {
            if (!isNotPrimes[i]) {
                for (int j = 2; j * i <= n; j++) {
                    isNotPrimes[j * i] = true;
                }
                if (squares.contains(i + 2)) {
                    ans += 2;
                }
                if (i <= Math.sqrt(Integer.MAX_VALUE)) {
                    squares.add(i * i);
                }
            }
        }
        System.out.println(ans + 1);
    }
    
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}