#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000

int main(){	
	
	long long a,b,c;
	cin>>a>>b>>c;
	
	long long x = (b+a-1)/b;
	long long y = (c+a-1)/c;
	
	if(y*3<=x*2)cout<<"YES"<<endl;
	else cout<<"NO"<<endl;
	
	return 0;
	
}