#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
#include<unordered_map>
#include<unordered_set>
#include<random>
using namespace std;
int a;
int b;
int c;
int main(){
	cin >> a;
	cin >> b;
	cin >> c;
	int countt = a / b;
	if (a%b){
		countt++;
	}
	int cc = a / c;
	if (a%c){
		cc++;
	}
	double C = cc;
	double CC = countt;
	CC *= 2.0;
	CC /= 3.0;
	if (C <= CC){
		puts("YES");
	}
	else{
		puts("NO");
	}
	return 0;
}