import math

A, B, C, D, E = map(int, input().split())

F = (A + B) * (C + D) // math.gcd(A + B, C + D)

n = 0
for i in range(F):
    if (i % (A + B) < A) and (i % (C + D) < C):
        n += 1

m = n * (E // F)
for i in range(E % F):
    if (i % (A + B) < A) and (i % (C + D) < C):
        m += 1

print(m)