#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <deque>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <utility>
#include <vector>
#define p(s) cout<<(s)<<endl
#define REP(i,n,N) for(int i=n;i<N;i++)
#define RREP(i,n,N) for(int i=N-1;i>=n;i--)
#define CK(n,a,b) ((a)<=(n)&&(n)<(b))
#define F first
#define S second
typedef long long ll;
using namespace std;
const int mod = 1e9+7;

int a, b, c;
int main(){
    cin>>a>>b>>c;
    int nb = (a+b-1)/b;
    int nc = (a+c-1)/c;
    if(nc*3 <= 2*nb){
        p("YES");
    }else{
        p("NO");
    }
    return 0;
}