# your code goes here
import math
a=[float (i) for i in range (3)]
n=a[0]/a[1]
m=a[0]/a[2]
nc=math.floor(n)
mc=math.floor(m)
if nc!=n:
    nc+=1
if mc!=m:
    mc+=1
nc*=2
mc*=3
if mc<=nc:
    print ("YES")
else:
    print ("No")