#include <bits/stdc++.h>
using namespace std;

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);  
	int a, b, c;
	cin >> a >> b >> c;
	int d = (a + b - 1) / b;
	int e = (a + c - 1) / c;
	if(3 * e <= 2 * d) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
	return 0;	
}