#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
int main() {
    // Input
    int a, b, c;
    cin >> a >> b >> c;

    // Output
    int x = (a + b - 1) / b;
    int y = (a + c - 1) / c;
    if (y <= 2 * x / 3) cout << "YES" << endl;
    else cout << "NO" << endl;
}