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

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

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

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

print ans