import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

public class Main {

	public static int cmmdc(int a, int b){
		
		int t;
	    while (b != 0)
	    {
	        t = b;
	        b = a % b;
	        a = t;
	    }
	    return a;
	}
	
	public static boolean isIreductible(int x, int y){
		
		boolean toReturn = false;
		
		if(cmmdc(x,y) == 1)
			toReturn = true;
		else toReturn = false;
		
		return toReturn;
	}
	
	public static int solution(int n){
	
		int nr = 0;
		
		for(int i=1; i<=n; ++i)
			for(int j=1; j<=n; ++j)
				if(isIreductible(i,j))
					++nr;
		
		return nr;
	}
	
	public static void main(String args[]) throws FileNotFoundException{
		
		Scanner sc = new Scanner(new FileInputStream("fractii.in"));
		
		int n = sc.nextInt();
		
		PrintWriter writer = new PrintWriter("fractii.out");
		
		writer.write(""+solution(n));
		
		writer.close();
		sc.close();
	}
}