#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>

#define ALL(x) (x).begin(),(x).end()
#define RALL(x) (x).rbegin(),(x).rend()
#define REP(i,a,n) for(int i = (a);i < (n);i++)
#define PI 3.14159265359
#define MOD 1000000007

using namespace std;

int main(){
    double a,b,c,cb,cc;
    cin >> a >> b >> c;
    cb = ceil(a/b);
    cc = ceil(a/c);
    if(cb*2/3 >= cc)cout << "YES\n";
    else cout << "NO\n";
    return 0;
}