import java.util.*; 

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

    	
    }
}

