import numpy as np

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 k>=b-a and k>=c-a and k>=d-a and k>=e-a and k>=c-b and k>=d-b and k>=e-b and k>=d-c and k>=e-c and k>=e-d:

  print("Yay!")

else:

  print(":(")
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 k>=b-a and k>=c-a and k>=d-a and k>=e-a and k>=c-b and k>=d-b and k>=e-b and k>=d-c and k>=e-c and k>=e-d:

  print("Yay!")

else:

  print(":(")
import numpy as np

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 (
    k >= b - a
    and k >= c - a
    and k >= d - a
    and k >= e - a
    and k >= c - b
    and k >= d - b
    and k >= e - b
    and k >= d - c
    and k >= e - c
    and k >= e - d
):
    print("Yay!")
else:
    print(":(")

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 (
    k >= b - a
    and k >= c - a
    and k >= d - a
    and k >= e - a
    and k >= c - b
    and k >= d - b
    and k >= e - b
    and k >= d - c
    and k >= e - c
    and k >= e - d
):
    print("Yay!")
else:
    print(":(")

-import numpy as np -