n = int(input())
a, b, c = map(int, input().split())
L = [a, b, c]
from math import gcd
from functools import reduce

def f(*args):
    lcm = reduce(lambda x,y: x*y//gcd(x,y), args, 1)
    return n//lcm

import itertools
ans = 0
for i in range(1, 4):
    C = itertools.combinations(L, i)
    for c in C:
      if i % 2 == 0:
        ans -= f(*c)
      else:
        ans += f(*c)
print(ans)