#include using namespace std; #define rep(i, n) for (int i = 0; i < (int)(n); i++) #define all(x) (x).begin(), (x).end() using ll = long long; const ll MOD = 998244353; #include using namespace atcoder; using mint = modint998244353; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); ll q,k;cin>>q>>k; ll p=(q+1)/2; if(max(p+1,q-p+2)>k){ cout<<"No"<