import java.util.Scanner;

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