import math

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


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

def solve(N, a, b, c):
    na = N // a
    nb = N // b
    nc = N // c
    nab = N // lcm(a, b)
    nbc = N // lcm(b, c)
    nca = N // lcm(c, a)
    nabc = N // lcm(lcm(a, b), c)
    return na + nb + nc - nab - nbc - nca + nabc
    
print(solve(N, a, b, c))