#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
#define MOD 1000000007
using namespace std;
typedef long long LL;
typedef vector<int> VI;

int main() {
	double a, b, c;
	cin >> a >> b >> c;
	if (ceil(a / c) * 3 <= ceil(a / b) * 2) cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}