#include<bits/stdc++.h>

using namespace std;

// 9(6) -> 7(3) ->1(2)

int main(){
	int i, j, k, l;
    int n,m;
    int a,b,c;
    
    cin >>a>>b>>c;
    
    n = (a+b-1)/b;
    m = (a+c-1)/c;
    
    puts((m*3<=n*2)?"YES":"NO");
    
	return 0;
}