a, b, c, d, e = map(int, input().split())

t = (a + b) * (c + d)
cnt = 0
for i in range(t):
	if (i % (a + b) < a and i % (c + d) < c):
		cnt += 1

ans = e // t * cnt

e %= t

for i in range(e):
	if (i % (a + b) < a and i % (c + d) < c):
		ans += 1

print(ans)