// No.218 経験値1.5倍
// https://yukicoder.me/problems/no/218
//
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
using namespace std;

string solve(int a, int b, int c);


int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    int a, b, c;
    cin >> a >> b >> c;
    string ans = solve(a, b, c);
    cout << ans << endl;
}

string solve(int a, int b, int c) {
    int normal = ceil(static_cast<double>(a) / b);
    int campaign = ceil(static_cast<double>(a) / c);

    if ((normal * 2 / 3) >= campaign)
        return "YES";
    else
        return "NO";
}