#yuki1486
a,b,c,d,e=map(int,input().split())
n=(a+b)*(c+d)
l=[]
for i in range(n):
 if i%(a+b)<a and i%(c+d)<c:
  l.append(1)
 else:
  l.append(0)
print(sum(l)*(e//n)+sum(l[0:e%n]))