a,b,c,d,e = map(int,input().split())
T = (a+b)*(c+d)
q,r = divmod(e,T)
ans = 0
for i in range(T):
    if i%(a+b) < a and i%(c+d) < c:
        ans += 1
ans *= q
for i in range(r):
    if i%(a+b) < a and i%(c+d) < c:
        ans += 1
print(ans)