from math import gcd

def lcm(x, y):
    return x * y // gcd(x, y)

n = int(input())
a, b, c = map(int, 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(a, lcm(b, c))
print(ans)