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

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

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

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