#include<iostream>
#include<cmath>
using namespace std;

int main(){
	int a,b,c;cin>>a>>b>>c;
	int tb=ceil((double)a/b);
	int tc=ceil((double)a/c);
	if((double)tb*2/3.0+0.000000001>=tc){cout<<"YES"<<endl;}
	else cout<<"NO"<<endl;
	return 0;
}