A,B,C,D,E=map(int,input().split())
T=(A+B)*(C+D)
time=[0]*T
for t in range(T):
    if t%(A+B)<A and t%(C+D)<C:
        time[t]=1
x=sum(time)
ans=x*(E//T)
for  t in range(E%T):
    ans+=time[t]
print(ans)