#include <iostream>
using namespace std;
int main(){
    int a,b,c;cin>>a>>b>>c;
    int d = (a-1)/b+1;
    int e = (a-1)/c+1;
    int f = (d*2)/3;
    if(f >= e)cout << "YES" << endl;
    else cout << "NO" << endl;
}