from math import gcd

A, B, C, D, E = map(int, input().split())

x = gcd(A + B, C + D)
y = ([1] * A + [0] * B) * ((A+B)//x)
z = ([1] * C + [0] * D) * ((C+D)//x)

c = 0
for i in range(x):
    if y[i] == 1 and z[i] == 1:
        c += 1

result = E // x * C
for i in range(E % x):
    if y[i] == 1 and z[i] == 1:
        result += 1

print(result)