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

N = int(input())
a, b, c = map(int, input().split())
l1 = lcm(a, b)
l2 = lcm(b, c)
l3 = lcm(c, a)
l4 = lcm(l1, c)
print(N // a + N // b + N // c - N // l1 - N // l2 - N // l3 + N // l4)