import java.util.Scanner;

import java.util.InputMismatchException;

public class Socks $\{$

public static void main$($String$[]$ args$)\{$

Scanner scnr $=$ new Scanner$($System$.$in$)$;

int numSocks;

try $\{$

numSocks $=$ scnr$.$nextInt$()$;

System.out.println$(($numSocks $/2)+"$ pairs of socks"$)$;

$\}$

$\}$

$\}$