import java.util.*;
import static java.lang.System.*;
import java.math.*;
 
public class Main{
  public static void main(final String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    if(N%2==0){
      out.print(N/2)
    }
     else{
       out.print(N/2+1)
     }
  }
  }

