#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;

int main(void){
    double a,b,c;
    cin >> a >> b >> c;
    double nb = ceil(a/b);
    double nc = ceil(a/c);
    if(nb * (2./3) >= nc)
    	cout << "YES" << endl;
    else
    	cout << "NO" << endl;
	return 0;
}