import fractions

lcm = lambda a, b: a * b // fractions.gcd(a, b)

N = int(input())
A, B, C = map(int, input().split())
lcm_ab = lcm(A, B)
ans = N // A + N // B + N // C + N // lcm(lcm_ab, C) - N // lcm_ab - N // lcm(
    B, C) - N // lcm(C, A)

print(ans)