import sys
input = sys.stdin.readline

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

X=(A+B)*(C+D)

X1=[0]*X
X2=[0]*X

time=0
for i in range(X):
    if time<A:
        X1[i]=1
    time+=1
    time%=(A+B)

time=0
for i in range(X):
    if time<C:
        X2[i]=1
    time+=1
    time%=(C+D)

L=0
for i in range(X):
    if X1[i]==1 and X2[i]==1:
        L+=1

ANS=E//X*L
E%=X

for i in range(E):
    if X1[i]==1 and X2[i]==1:
        ANS+=1

print(ANS)