from math import gcd
a, b, c, d, e = map(int, input().split())
t = (a + b) * (c + d) // gcd(a + b, c + d)
tmp1 = [1] * a + [0] * b
tmp2 = [1] * c + [0] * d
l1, l2 = tmp1 * (t // (a + b)), tmp2 * (t // (c + d))
l = [1 if l1[i] and l2[i] else 0 for i in range(t)]
cnt = l.count(1)
print(e // t * cnt + sum(l[:e % t]))