def gcd(a, b):
    if a < b:
        a,b = b,a
    while b > 0:
        r = a % b
        a,b = b,r
    return a

def lcm(a, b):
    if a == 0 or b == 0:
        print("Error")
        return 0
    return int(a * b // gcd(a, b))

def calc(N, li):
    ret = 0
    a, b, c = li

    ret += N // a + N // b + N // c;
    ret -= N // lcm(a, b) + N // lcm(b, c) + N // lcm(c, a);
    ret += N // lcm(a, lcm(b, c));

    return ret

print(calc(int(input()), [int(i) for i in input().split()]))