//Bai 15
 
#include<bits/stdc++.h>
using namespace std;
#define el "\n"
#define ll long long
#define ull unsigned long long
#define se second
#define fi first
#define be begin()
#define en end()
#define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
int n;
void Run()
{
    cin >> n;
    //for(int i = 0; i <= n/2; i++)
    //{
        //cout << i << "," << n - i << ";";
    //}
    cout << n / 2 + 1;
}
int main()
{
    Faster;
    Run();
    return 0;
}
 
 

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