#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a, b, c;
    double n, m;
    cin >> a >> b >> c;
    n = ceil(float(a) / b);
    n *= 2/3.0;
    m = ceil(float(a) / c);        //  キャンペーン期間
    cout << (n >= m? "YES" : "NO") << endl;
    return 0;
}