import java.util.*;

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