A,B,C,D,E = map(int,input().split())
together=[0]*(A+B)*(C+D)
for t in range((A+B)*(C+D)):
    if t%(A+B)<A and t%(C+D)<C:together[t]=1

print(sum(together)*(E//((A+B)*(C+D))) + sum(together[:E%((A+B)*(C+D))]))