n = gets.to_i
a = gets.chomp.split.map(&:to_i)
c = 0
n.times do |i|
if (i+1) % a[0] == 0
c += 1
elsif (i+1) % a[1] == 0
c += 1
elsif (i+1) % a[2] == 0
c += 1
end
end
p c