a, b, c, d, e = read_line.split.map(&.to_i)
len = (a + b).lcm(c + d)
ab = ([true] * a + [false] * b) * (len // (a + b))
cd = ([true] * c + [false] * d) * (len // (c + d))
abcd = ab.zip(cd)
puts abcd.count { |x, y| x && y } * (e // len) +
     abcd[0, e % len].count { |x, y| x && y }