a=int(input())
b=int(input())
c=int(input())
if (a/b)!=int(a/b):
    no=int(a/b+1)
else:
    no=a/b
if (a/c)!=int(a/c):
    ca=int(a/c+1)
else:
    ca=a/c

if ca*(3/2)<=no:
    print("YES")
else:
    print("NO")