A,B,C,D,E=map(int,input().split())
import math
ptA,ptB=A+B,C+D
S=math.gcd(ptA,ptB)*(ptA)*(ptB)
cnt_cir=0
ans=0
for i in range(S):
    if i%ptA<A and i%ptB<C:
        cnt_cir+=1
ans+=cnt_cir*(E//S)
E-=E//S*S
for i in range(E):
    if i%ptA<A and i%ptB<C:
        ans+=1
print(ans)