#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <stdio.h>
#include <algorithm>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream>
using namespace std;
int main() {
	int a, b, c;
	int kazu = a/b;
	if (a%b != 0) kazu++;
	int plusnow = a / c;
	if (a%c != 0) plusnow++;
	if (kazu * 3 <= plusnow * 2) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
}