import java.util.*;

class Atcoder_c139b{
	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 / 2 + 1);
		}
	}
	
	}