a,b,c,d,e = map(int,input().split())

ma = (a+b)*(c+d)

mul,left = divmod(e, ma)
ans = 0
count = 0

for i in range(1,ma):

    if 0 < i%(a+b) <= a and 0 < i%(c+d) <= c:
        count += 1

    if i == left:
        ans += count

ans += count*mul
print(ans)