#include<bits/stdc++.h> using namespace std; int main(){ int a,b,c,d; cin>>a>>b>>c>>d; if(abc>=d*1000){ cout<<"Yes"; } else{ cout<<"No"; } return 0; }

#include<iostream> using namespace std; int main(){ long long a,b,c,d; cin>>a>>b>>c>>d; if(abc>=d*1000){ cout<<"Yes"; } else{ cout<<"No"; } return 0; }

#include <iostream> using namespace std;int main(){int a,b,c,d;cin>>a>>b>>c>>d;if(abc>=d*1000){cout<<"Yes";}else{cout<<"No";}return 0;}