// #include <bits/stdc++.h> using namespace std; #define fi first #define se second #define all(x) x.begin(), x.end() #define lch (o << 1) #define rch (o << 1 | 1) typedef double db; typedef long long ll; typedef unsigned int ui; typedef pair<int, int> pint; typedef tuple<int, int, int> tint; const int INF = 0x3f3f3f3f; const ll INF_LL = 0x3f3f3f3f3f3f3f3f; int main() { ios::sync_with_stdio(0); int n; cin >> n; if (n % 2 == 1) { cout << 1 << endl; } else { cout << 1 + n / 2 << endl; } return 0; }