import java.util.*;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		if(N%2!=0)ans = ans+1;
		ans += N/2;
		System.out.println(ans);
	}
}


	 import java.util.*; util.* java public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		if(N%2!=0)ans = ans+1;
		ans += N/2;
		System.out.println(ans);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		if(N%2!=0)ans = ans+1;
		ans += N/2;
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		if(N%2!=0)ans = ans+1;
		ans += N/2;
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int ans = 0; ans 0 if(N%2!=0)ans = ans+1; N%2!=0 N%2 N 2 0 ans = ans+1 ans ans+1 ans 1 ans += N/2 ans N/2 N 2 System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		if(N%2!=0)ans = ans+1;
		ans += N/2;
		System.out.println(ans);
	}
} public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		if(N%2!=0)ans = ans+1;
		ans += N/2;
		System.out.println(ans);
	}
} Main
import java.util.*;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		if(N%2!=0)ans = ans+1;
		ans += N/2;
		System.out.println(ans);
	}
}


	