import java.util.Scanner;

public class casa {
    public static void main(String[] args){

        Scanner in = new Scanner(System.in);
        System.out.print("x=");
        int ss=0;
        int x = in.nextInt();
        for(int i = 1 ; i <= x; i++){
            for(int j = 1 ; j <= x ; j++){
                int d = 2, s = 0;
                while(d<=i) {
                    if (i % d == 0 && j % d == 0){
                        s++;
                    }
                    d++;
                }
                if(s == 0) ss++;
            }
        }
        System.out.println(ss);
    }
}