1#include <iostream>2using namespace std;3 4int main() {5 double V,T,S,D,hittime;6 cin>>V>>T>>S>>D;7 hittime=D/V;8 if(hittime<T || hittime>S)9 {10 cout<<"Yes";11 }12 else13 {14 cout<<"No";15 }16 return 0;17}