#include <iostream>
using namespace std;

int main() {
	
	int a,b,c;
	int ntime, stime;
	
	cin>>a;
	cin>>b;
	cin>>c;
	
	ntime = a/b;
	stime = a/c;
	
	if(ntime*(2/3)>=stime){
		cout<<"YES"<<endl;
	}else{
		cout<<"NO"<<endl;
	}
	
	return 0;
}