// #define _GLIBCXX_DEBUG // for STL debug (optional) #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using ll = long long int; using int64 = long long int; template void chmax(T &a, T b) {a = max(a, b);} template void chmin(T &a, T b) {a = min(a, b);} template void chadd(T &a, T b) {a = a + b;} int dx[] = {0, 0, 1, -1}; int dy[] = {1, -1, 0, 0}; const int INF = 1LL << 29; const ll LONGINF = 1LL << 60; const ll MOD = 1000000007LL; void drop(string s) { cout << s << endl; exit(0); } int main() { ll L, R, M, K; cin >> L >> R >> M >> K; if(K == 0 or L % M == 0 or R % M == 0) { drop("Yes"); } if(L/M != R/M) { drop("Yes"); } ll sl = K; ll sr = (M-1) * K; if(sl % M == 0 or sr % M == 0) { drop("Yes"); } if(sl/M != sr/M) { drop("Yes"); } drop("No"); return 0; }