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);
				}
		 
				if ( n % 2 == 1) {
					System.out.println(n / 2 + 1);
				}
		 
			}
		 
		}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz