a,b,c,d,e = map(int,input().split())
loop = (a+b)*(c+d)
ok = [0]
for i in range(1,loop+1):
    pre = ok[-1]
    if 0 < i%(a+b) <= a and 0 < i%(c+d) <= c:
        ok.append(pre+1)
    else:
        ok.append(pre)
#print(ok)
num = e//loop
amari = e%loop
ans = num*ok[-1] + ok[amari]
print(ans)