#include #include #include #include #include #include #include #include #include #include #include #include #include #include #define rep(i, a, b) for (int i = (a); i < (b); ++i) #define all(x) (x).begin(), (x).end() #define MOD 1000000007 #define int long long using ll = long long; using namespace std; const int INF = 1LL << 50; using P = pair; template bool chmin(T &a, T b) { if (a > b) { a = b; return true; } else { return false; } } template bool chmax(T &a, T b) { if (a < b) { a = b; return true; } else { return false; } } struct Setup { Setup() { cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); } } SETUP; signed main() { int n; cin >> n; int one = n / 4; int rem = n % 4; rem /= 2; int ans = one * (one + rem); cout << ans << endl; }