import sys



args = [int(eval(input())) for i in range(6)]





for arg1 in args[:5]:

    for arg2 in args[1:5]:

        if (arg2 - arg1) > args[5]:

            print(":(")

            sys.exit()

print("Yay!")
import sys



args = [int(eval(input())) for i in range(6)]



if (args[4] - args[0]) > args[5]:

    print(":(")

    sys.exit()

print("Yay!")
import sys

args = [int(eval(input())) for i in range(6)]
for arg1 in args[:5]:
    for arg2 in args[1:5]:
        if (arg2 - arg1) > args[5]:
            print(":(")
            sys.exit()
print("Yay!")

import sys

args = [int(eval(input())) for i in range(6)]
if (args[4] - args[0]) > args[5]:
    print(":(")
    sys.exit()
print("Yay!")

-for arg1 in args[:5]: -    for arg2 in args[1:5]: -        if (arg2 - arg1) > args[5]: -            print(":(") -            sys.exit() +if (args[4] - args[0]) > args[5]: +    print(":(") +    sys.exit()