"""

"""

import sys
from sys import stdin
import math


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

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

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

rem = E % g
en = 0
for i in range(rem):
    if i % (A+B) < A and i % (C+D) < C:
        en += 1

#print (g,rem,gn,en)

print (E // g * gn + en)