# coding: utf-8

# Your code here!

a=int(eval(input()))

b=int(eval(input()))

c=int(eval(input()))

d=int(eval(input()))

e=int(eval(input()))

k=int(eval(input()))

if e-a<=k:

    print("Yay!")

else:

    print(":(")
# coding: utf-8

a=int(eval(input()))

b=int(eval(input()))

c=int(eval(input()))

d=int(eval(input()))

e=int(eval(input()))

k=int(eval(input()))



if e-a>k:

    print(":(")

else:

    print("Yay!")





# coding: utf-8
# Your code here!
a = int(eval(input()))
b = int(eval(input()))
c = int(eval(input()))
d = int(eval(input()))
e = int(eval(input()))
k = int(eval(input()))
if e - a <= k:
    print("Yay!")
else:
    print(":(")

# coding: utf-8
a = int(eval(input()))
b = int(eval(input()))
c = int(eval(input()))
d = int(eval(input()))
e = int(eval(input()))
k = int(eval(input()))
if e - a > k:
    print(":(")
else:
    print("Yay!")

-# Your code here! -if e - a <= k: +if e - a > k: +    print(":(") +else: -else: -    print(":(")