#include<iostream>
#include<string>

using namespace std;

int main(){

	int a,b,c;
	int bc,cc;

	cin>>a>>b>>c;

	bc=a/b+(a%b!=0);
	cc=a/c+(a%c!=0);

	if((double)cc/bc<=(double)2/3) cout<<"YES"<<endl;
	else cout<<"NO"<<endl;

}