A, B, C, D, E = map(int, input().split())
cyc = (A+B)*(C+D)
cnt = cnt2 = 0
for i in range(cyc):
    if i%(A+B)<A and i%(C+D)<C:
        cnt += 1
    if i+1==E%cyc:
        cnt2 = cnt
ans = E//cyc*cnt + cnt2
print(ans)