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

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    int a,b,c; cin >> a >> b >> c;
    b = (a + b - 1) / b;
    c = (a + c - 1) / c;
    cout << (3*c<=2*b?"YES":"NO") << endl;
}