from math import gcd

A, B, C, D, E = map(int, input().split())
AB, CD = A + B, C + D
lcm = AB * CD // gcd(AB, CD)
cnt = 0
for i in range(lcm):
    if i % AB < A and i % CD < C:
        cnt += 1
        
ans = E // lcm * cnt
E %= lcm
for i in range(E):
	if i % AB < A and i % CD < C:
		ans += 1
  
print(ans)