#include #include #include using namespace std; using namespace atcoder; using mint = modint998244353; #define rep(i,n) for (int i = 0; i < (n); ++i) #define Inf32 1000000005 #define Inf64 1000000000000000001LL int main(){ int Q,K; cin>>Q>>K; if(K < 1 + (Q/2)){ cout << "No" << endl; return 0; } cout<<"Yes"<