n = gets.strip.to_i
a, b, c = gets.strip.split(' ').map(&:to_i).sort
# p a, b, c

if c % a != 0 && c % b != 0 && b % a != 0
	p n / a + n / b + n / c - n / (a.lcm(b)) - n / (b.lcm(c)) - n / (c.lcm(a)) + n / (a.lcm(b).lcm(c))	
elsif c % a == 0 && b % a == 0
	p n / a
elsif c % a == 0 && c % b != 0 || c % a != 0 && c % b == 0
	p n / a + n / b - n / (a.lcm(b))
end