A, B, C, D, E = gets.split.map(&:to_i)

period = (A + B).lcm(C + D)
in_period = 0
(0 ... period).each do |t|
    t1 = t % (A + B)
    t2 = t % (C + D)
    in_period += 1 if t1 < A and t2 < C
end

out_period = 0
(0 ... E % period).each do |t|
    t1 = t % (A + B)
    t2 = t % (C + D)
    out_period += 1 if t1 < A and t2 < C
end

puts E / period * in_period + out_period