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

def gcd(a, b):
    if b == 0:
        return a
    return gcd(b, a % b)
def lcm(a, b):
    return a * b // gcd(a, b)
def f(x):
    return N // x

ans = f(a) + f(b) + f(c) - f(lcm(a, b)) - f(lcm(b, c)) - f(lcm(c, a)) + f(lcm(lcm(a, b), c))
print(ans)