#include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <iomanip>
using namespace std;
using ll = long long;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    int n1 = (a + b - 1) / b;
    int n2 = (a + c - 1) / c;
    if(n1*2 >= n2*3) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
}