#include <iostream> #include <vector> #include <cmath> #include <map> #include <set> #include <iomanip> #include <queue> #include <algorithm> #include <numeric> #include <deque> #include <complex> #include <cassert> using namespace std; using ll = long long; int main(){ int N; cin >> N; if (N % 2 == 1) cout << 1 << endl; else cout << N/2 << endl; return 0; }