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]))