def gcd(a, b):
    while b:
        a, b = b, a % b
    return a

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

N = int(input())
a, b, c = map(int, input().split())
print(N // a + N // b + N // c - N // lcm(a, b) - N // lcm(b, c) - N // lcm(c, a) + N // lcm(lcm(a, b), c))