import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Tester {

	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int num = Integer.parseInt(br.readLine());
		if(num%2 == 0) {
			System.out.println(num/2);
		}else {
			System.out.println(num/2 + 1);
		}
	}
}