#include <bits/stdc++.h>

using namespace std;

int main()
{
    int a, b, c;
    cin >> a >> b >> c;
    int bb, cc;
    for (int i = 1; i < 10000000; i++)
    {
        if (b * i >= a)
        {
            bb = i;
            break;
        }
    }
    cc = bb * 2 / 3;
    if (cc * c >= a) cout << "YES" << endl;
    else cout << "NO" << endl;
}