#include using namespace std; #define rep(i, n) for (int i = 0; i < (n); ++i) using ll = long long; using ull = unsigned long long; int main() { cin.tie(nullptr)->sync_with_stdio(false); int n; cin >> n; vector a(n); rep(i, n) cin >> a[i]; cout << (accumulate(a.begin(), a.end(), 0LL) > 0 ? "Yes" : "No") << '\n'; return 0; }