require "prime"
n = gets.to_i
a, b, c = gets.split.map(&:to_i)
r = n / a + n / b + n / c
r -= n / (a.lcm(b)) + n / (b.lcm(c)) + n / (c.lcm(a))
r += n / (a.lcm(b).lcm(c))
puts r