def gcd(a, b):
    if b == 0:
        return a
    return gcd(b, a % b)


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


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

    a1, b1, c1 = n // a, n // b, n // c
    ab = n // lcm(a, b)
    ac = n // lcm(a, c)
    bc = n // lcm(b, c)
    abc = n // lcm(lcm(a, b), c)
    print(a1 + b1 + c1 - ab - ac - bc + abc)

    
if __name__ == '__main__':
    main()