imput1 = gets.to_i
imput2 = gets.split.map(&:to_i)
i = 0
sum = 0 
until  i > imput1
    i = i + 1
    if i % imput2[0] == 0
        sum = sum + 1
     elsif i % imput2[1] == 0
        sum = sum + 1
    elsif i % imput2[2] === 0
        sum = sum + 1
    else
    end
end
p sum