def gcd(a, b):
  if b == 0: return a
  return gcd(b, a % b)
n = input()
x = raw_input()
[a,b,c] = x.split(' ')
[a,b,c] = [int(a),int(b),int(c)]
print n/a+n/b+n/c-n/(a*b/gcd(a,b))-n/(a*c/gcd(a,c))-n/(b*c/gcd(b,c))+n/(a*b*c/(gcd(a,b)*gcd(a,c)*gcd(b,c)))