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

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

p_a = N // a
p_b = N // b
p_c = N // c
p_ab = N // lcm(a,b)
p_bc = N // lcm(b,c)
p_ca = N // lcm(c,a)
p_abc = N // lcm(lcm(a,b), c)

print(p_a + p_b + p_c - p_ab - p_bc - p_ca + p_abc)