a,b,c=[int(input()) for i in range(3)]

def f(w):
    res,s=0,0
    while True:
        res+=1
        s+=w
        if s>=a:
            break
    return res

before,after=f(b),f(c)
if after/before<=2/3:
    print("YES")
else:
    print("NO")