from math import floor
n = int(input())
a, b, c = map(int, input().split())


def gcd(a, b):
    while b:
        a, b = b, a % b
    return a


def lcm(a, b):
    return a * b // gcd(a, b)


res1 = floor(n / a) + floor(n / b) + floor(n / c)
res2 = floor(n / lcm(a,b)) + floor(n / lcm(b,c)) + floor(n / lcm(c,a))
res3 = floor(n / lcm(a,lcm(b,c)))

print(res1 - res2 + res3)