C++ :

#include<bits/stdc++.h>
using namespace std;
 
int main(){
    int n;
    cin>>n;
    if(n % 2 == 0){
        cout<<n / 2 + n / 2 + 1<<endl;
    } else{
        cout<<n / 2 + 1<<endl;
    }
    return 0;
}

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int s;
		if(n % 2 == 1){
			s = (n + 1) / 2;
			System.out.println(s);
		}else if(n % 2 == 0){
			s = n + 1;
			System.out.println(s);
		}
	}

}