import java.util.*;

public class A{
	public static void main(String[] args) {
		// TODO Auto-generated method stub
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();

        if(n%2==0) {
        System.out.println(n/2);
        }else {
        	System.out.println(n/2+1);
        }
	}

}
