#include <iostream>
#include <iomanip>

#include <algorithm>
#include <math.h>

#include <string>
#include <list>
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed;//
    //cout << setprecision(6);//

	int a,b,c;
	cin>>a>>b>>c;
	//a[1,10^6-1]
	//bc[1,10^6-1]
	int bb = a/b;
	if(a != b*bb){
		++bb;
	}
	int cc = a/c;
	if( a != c*cc){
		++cc;
	}

	if(bb*2 >= 3*cc){
		P("YES");
	}else{
		P("NO");
	}
    return 0;
}