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/2 + 1));
    }
	}
}