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

int a,b,c,ab,ac;

int main(){
	cin>>a>>b>>c;
	if(a%b==0) ab=a/b;
	else ab=(a/b)+1;
	if(a%c==0) ac=a/c;
	else ac=(a/c)+1;
	if(ab*2/3<ac) cout<<"NO"<<endl;
	else cout<<"YES"<<endl;
	return 0;
}