import math
from functools import reduce

n = int(input())
a, b, c = map(int, input().split())

na = n // a
nb = n // b
nc = n // c

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

ab = lcm(a, b)
nab = n // ab

bc = lcm(b, c)
nbc = n // bc

ac = lcm(a, c)
nac = n // ac

def lcm_list(numbers):
    return reduce(lcm, numbers, 1)

abc = lcm_list([a, b, c])
nabc = n // abc

print(na + nb + nc - nab - nbc - nac + nabc)