#include<iostream>
#include<math.h>
using namespace std;
int main(void)
{
	long double a, b, c, x, y;
	cin >> a >> b >> c;
	x = ceil(a / b);
	y = ceil(a / c);
	if (x >=1.5*y)
		cout << "YES" << endl;
	else cout << "NO" << endl;



	return 0;
}