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

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

    r = a % b
    d = gcd(b, r)
    return d

def lcm(a, b):
    return a*b//gcd(a, b)
ans = N // a + N // b + N // c
ans -= N // lcm(a, b) + N // lcm(a, c) + N // lcm(b, c)
ans += N // lcm(lcm(a, b), c)

print(ans)