from math import gcd
A,B,C,D,E = map(int,input().split())

x = (A+B)*(C+D)//gcd(A+B,C+D)
y = ([True]*A+[False]*B)*(x//(A+B))
z = ([True]*C+[False]*D)*(x//(C+D))

c = 0
for i in range(x):
    if not y[i] or not z[i]:continue
    c+=1

ans = E//x*c
for i in range(E%x):
    if not y[i] or not z[i]:continue
    ans+=1
print(ans)