# https://atcoder.jp/contests/abc123/tasks/abc123_a


a = gets.to_i
b = gets.to_i
c = gets.to_i
d = gets.to_i
e = gets.to_i
k = gets.to_i

mi, mx = [a, b, c, d, e].minmax

puts mx - mi > k ? ':(' : 'Yay!'
