from functools import reduce
from math import gcd


A,B,C,D,E = map(int,input().split())
T = (A + B) * (C + D) // gcd(A + B, C + D)
dp = [0] * T
for t in range(0, T, A + B):
	dp[t] += 1
for t in range(A, T, A + B):
	dp[t] -= 1
for t in range(0, T, C + D):
	dp[t] += 1
for t in range(C, T, C + D):
	dp[t] -= 1
for t in range(T - 1):
	dp[t + 1] += dp[t]

print(E // T * dp.count(2) + dp[:E % T].count(2))