import java.util.*;
import java.io.*;
import java.lang.Exception;

public class Main{
	public static void main(String[] args)
			throws IOException
	{
		BufferedReader br = new BufferedReader(new
		InputStreamReader(System.in));
		int i=0;

		int a=Integer.parseInt(br.readLine());
		i=1+a/2;
		if(a%2==0)
			i=a/2;
		System.out.println(i);
		

	}
}
/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