a,b,c,d,e = map(int,input().split())
cou = 0
if (a+b)*(c+d) > e:
    for i in range(e):
        if i % (a+b) < a and i % (c+d) < c:
            cou += 1
else:
    for i in range((a+b)*(c+d)):
        if i % (a+b) < a and i % (c+d) < c:
            cou += 1
    cou *= e // ((a+b)*(c+d))
    for i in range(e % ((a+b)*(c+d))):
        if i % (a+b) < a and i % (c+d) < c:
            cou += 1
print(cou)