A, B, C, D, E = gets.split.map(&:to_i)
T = (A + B).lcm(C + D)
a1 = ([1] * A + [0] * B) * (Rational(T, A + B).ceil + 1)
a2 = ([1] * C + [0] * D) * (Rational(T, C + D).ceil + 1)
ans = 0
cnt = 0

0.upto(T - 1) do |t|
  next if a1[t] == 0
  next if a2[t] == 0
  cnt += 1
end

ans += cnt * (E / T)
R = E % T

0.upto(R - 1) do |r|
  next if a1[r] == 0
  next if a2[r] == 0
  ans += 1
end

puts ans