#include <bits/stdc++.h>
using namespace std;
#define REP(i, n) for(int(i)=0;(i)<(n);++(i))

int ceil(int a, int b){ return (a+b-1)/b; }

int main(){
    int a,b,c; cin >> a >> b >> c;
    int n = ceil(a,b) * 2 / 3;
    int m = ceil(a,c);
    cout << (n >= m ? "YES" : "NO") << endl;
}