import java.util.*; import java.io.*; import java.math.*; public class Main{ public static BufferedReader buff = new BufferedReader(new InputStreamReader(System.in)); public static final int INFI = Integer.MAX_VALUE; public static final long INFL = Long.MAX_VALUE; public static final int MOD = 1000000007; public static PrintWriter output = new PrintWriter(System.out); public static Scanner sc = new Scanner(System.in); public static final int [] dy4 = {0,1,0,-1}; public static final int [] dx4 = {1,0,-1,0}; public static ArrayList> list = new ArrayList<>(); public static ArrayList answer = new ArrayList<>(); public static boolean [] visited ; public static void main(String[] args) throws IOException{ StringTokenizer st; //st = new StringTokenizer(buff.readLine()); int N = sc.nextInt(); output.print(N % 2 == 0?N/2:1); output.flush(); } }