import math

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

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

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

d = lcm(a, b)
nab = n // d
e = lcm(b, c)
nbc = n // e
f = lcm(a, c)
nac = n // f

g = lcm(d, c)
nabc = n // g

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