# -*- coding: utf-8 -*-

N = input()
(A, B, C) = map(int, raw_input().split())

def gcd(p, q):
    if q == 0:
        return p
    return gcd(q, p % q)

def lcm(p, q):
    return p / gcd(p, q) * q

S0 = N / A + N / B + N / C
S1 = N / lcm(A, B) + N / lcm(B, C) + N / lcm(C, A)
S2 = N / lcm(lcm(A, B), C)

print S0 - S1 + S2