source_code: import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.util.Scanner;
  
  public class CodeForces
  {
  	public static void main(String[] args)
  	{
  		Scanner input = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
  
  		System.out.println(input.nextInt() / 2 + 1);
  	}
  }