#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

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