import java.io.BufferedReader;
import java.io.FileReader;
import java.io.PrintWriter;

public class Main {
	
	public static boolean checkForCoPrime(int a, int b) {
		
		if((a > 1) && (b > 1)) {
			if(a == b) {
				return false;
			}
			if((a > b)) {
				if(a % b == 0) {
					return false;
				}
				for(int i = 2; i <= Math.floor(b/2); i++) {
					if((a % i == 0) && (b % i ==0)) {
						return false;
					}
				}
			}
			if((b > a)) {
				if(b % a == 0) {
					return false;
				}
				for(int i = 2; i <= Math.floor(a/2); i++) {
					if((b % i == 0) && (a % i == 0)) {
						return false;
					}
				}
			}
		}
		
		return true;
		
	}
	
	public static void main(String[] args) {
		
		BufferedReader br = null;
		PrintWriter writer = null;
		int n = 0;
		try {
			br = new BufferedReader(new FileReader("fractii.in"));
			String sCurrentLine = br.readLine();
			n = Integer.parseInt(sCurrentLine);
			br.close();
		} catch(Exception e) {
			try {
				if (br != null) br.close();
			} catch (Exception ex) {
				ex.printStackTrace();
			}
		}
		int counter = 0;
		for(int i = 1; i <= n; i++) {
			for(int j = 1; j <= n; j++) {
				if(checkForCoPrime(i, j)) {
					counter++;
				}
			}
 		}
		try {
			writer = new PrintWriter("fractii.out", "UTF-16");
			writer.print(counter);
			writer.close();
		} catch(Exception e) {
			writer.close();
		}
		
		
	}
	
}