#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(n);i++)
#define pb push_back
#define all(v) (v).begin(),(v).end()
typedef vector<int>vi;

int main(){
    int a,b,c;
    cin>>a>>b>>c;

    int x=(a+b-1)/b;
    int y=(a+c-1)/c;

    if(x*2>=3*y)cout<<"YES"<<endl;
    else cout<<"NO"<<endl;
    return 0;
}