#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int main(){
    float a, b, c;
    cin >> a >> b >> c;
    cout << ((ceil(a/b)*2/3. >= ceil(a/c)) ? "YES" : "NO") << endl;
}