#coding: utf-8
##yuki_316

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

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

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

x=n/a+n/b+n/c
y=n/lcm(a,b)+n/lcm(b,c)+n/lcm(c,a)
z=n/lcm(a,lcm(b,c))

print x-y+z