#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<cstdio>
using namespace std;
int main(){
    long long a,b,c;
    cin >> a >> b >> c;
    b = (a-1+b) / b;
    c = (a-1+c) / c;
    if(c<=b*2/3) cout << "YES";
    else    cout << "NO";
    return 0;
}