import math
A,B,C,D,E=map(int,input().split())
ab=A+B
cd=C+D
L=ab*cd//math.gcd(ab,cd)
p=[0]*(L+1)
for i in range(L):
	p[i+1]=p[i]+(i%ab<A)*(i%cd<C)
n=E//L*p[L]+p[E%L]
print(n)