#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,b)  FOR(i,0,b)
#define X real()
#define Y imag()
#define F first
#define PB(a) push_back(a)
#define BE(c) c.begin(),c.end()
using namespace std;
typedef long long LL;
typedef pair<int,int> pr;
typedef pair<pr,int> ppr;
typedef priority_queue<pr,vector<pr>,greater<pr> > PQ;
typedef vector<pr> Vpr;
typedef vector<LL> VI;
typedef complex<LL> cld;
typedef vector<cld> Vcld;
typedef map<pr,int> MP;
const int SIZE=100010;
const LL INF=1<<28;
const LL p=7+1e+9;

int main(){
	int a,b,c;
	cin >> a >> b >> c;
	if((a+b-1)/b*2/3>=(a+c-1)/c)
		cout <<"YES" << endl;
	else 
		cout <<"NO" << endl;

}