from math import gcd

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

def f(x):
    return N//x

N = int(input())
a, b, c = map(int, input().split())
print(f(a) + f(b) + f(c) - f(lcm(a, b)) - f(lcm(a, c)) - f(lcm(b, c)) + f(lcm(lcm(a, b), c)))