#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <algorithm>
#include <map>
#include <set>
#include <cstdio>
#include <cmath>
#define rep(i,l,n) for(lint i=l;i<n;i++)
#define rer(i,l,n) for(lint i=l;i<=n;i++)
#define all(a) a.begin(),a.end()
#define o(a) cout<<a<<endl
#define pb(a) push_back(a)
#define mk(a,b) make_pair(a,b)
#define fi first
#define se second
using namespace std;
typedef long long lint;
typedef vector<int> vi;
typedef vector<lint> vli;
typedef vector<vi> vvi;
typedef pair<int,int> pii;

int upnum(double a){
	int res=a;
	if(a-res<1e-10) return res;
	return res+1;
}

int main(){
	double a,b,c;
	cin>>a>>b>>c;
	int x=upnum(a/b);
	int y=upnum(a/c);
	if(x*2/3>=y) o("YES");
	else o("NO");
}