#include using namespace std; using Int = long long; constexpr static int mod = 1e9 + 7; constexpr static int inf = (1 << 30) - 1; constexpr static Int infll = (1LL << 61) - 1; int Competitive_Programming = (ios_base::sync_with_stdio(false), cin.tie(nullptr), cout << fixed << setprecision(15), 0); #pragma GCC target("avx2") #pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") int main() { Int N, a, b; cin >> N >> a >> b; assert(1 <= N and N <= 1e18); assert(1 <= a and a < N); assert(1 <= b and b < N); if (gcd(a, b) == 1 and a + b <= N + 1) { cout << "YES\n"; } else { cout << "NO\n"; } }